In this episode of the Digging for Truth podcast, I explore one of the most challenging and controversial issues in the study of biblical chronology: the differing chronologies found in Genesis 5 and Genesis 11. Since the main manuscript traditions preserve different numbers, determining which tradition is original has profound implications for biblical chronology and history. Our discussion seeks to answer three central questions:
- Why do the ancient manuscripts contain different numbers?
- Who altered the numbers?
- What motivation could have led ancient scribes to modify the sacred text?
The Bible covers about 5600 years of redemptive history (according to my proposed chronological reconstruction), and about sixty percent of that time is concentrated across two chapters: Genesis 5 and 11. These genealogies do far more than provide family records. They establish a continuous timeline from creation through the Flood and eventually to Abraham. Each patriarch’s age at the birth of his named son/descendant is recorded, allowing readers to calculate elapsed time from one generation to the next. When these numbers are added together, they create a chronological framework for early biblical history.1
The Three Textual Traditions
The first major portion of our discussion introduces the three primary textual traditions that preserve Genesis 5 and 11.
The Masoretic Text
The Masoretic Text (MT) serves as the basis for nearly all modern English translations of the Old Testament. Preserved by Jewish scribes known as the Masoretes during the early medieval period, this Hebrew text contains vowel and other markings that were added to preserve pronunciation. On the whole, the MT has been remarkably well preserved. Although the surviving manuscripts are relatively late, they represent a long tradition of careful copying and faithful preservation. Modern Bible translators begin with this Hebrew text when producing English versions. For centuries, the MT has been treated as the default or standard Hebrew Bible. Consequently, most Christians assume that its numbers in Genesis 5/11 must also represent the originals written by Moses. While the Masoretic tradition deserves great respect, this assumption should not prevent scholars from evaluating the evidence objectively. The truth of the matter is that the MT is deficient in a number of places, including Genesis 5/11.
The Samaritan Pentateuch
The discovery of the Samaritan Pentateuch by European scholars during the sixteenth century provided an entirely new line of evidence for reconstructing the earliest form of the biblical text. Unlike the Jews, the Samaritans accepted only the first five books of Moses as Scripture. They maintained their own independent textual tradition, written in the distinctive Samaritan script. Although the oldest surviving Samaritan manuscripts are medieval, the tradition itself reaches back to antiquity. The Samaritans preserved their text independently from mainstream Judaism for many centuries.
What makes the Samaritan Pentateuch (SP) particularly important is that its numbers sometimes agree with the MT and sometimes agree with the Greek Septuagint.2 For example, portions of Genesis 5 contain numbers identical to the MT, while readings later in the antediluvian epoch diverge significantly. In the post-Flood genealogy of Genesis 11, the Samaritan chronology almost completely aligns with the Septuagint instead of the MT. This mixed pattern complicates the process of evaluating and reconstructing the textual evidence. Rather than presenting two opposing traditions, scholars must evaluate three independent sources whose agreements and disagreements vary throughout the two genealogies. Evaluating these competing witnesses is a formidable task.
The Greek Septuagint
Translated in Egypt beginning during the third century BC, the Septuagint represents the oldest surviving translation of the Hebrew Bible. The translators worked directly from an ancient Hebrew manuscript that no longer exists. Although that Hebrew exemplar has been lost, the Greek translation preserves the chronological numbers that appeared in it. These numbers differ significantly from those found in the MT.
In Genesis 5, many of the patriarchs are listed as being one hundred years older when they fathered the next generation than they are in the MT. These differences accumulate throughout the genealogy, making the LXX chronology roughly six hundred years longer than the MT before the Flood. The differences continue after the Flood in Genesis 11, where additional one-hundred-year differences appear in several patriarchal begetting ages. Altogether, the chronology from Adam to Abraham is approximately 1,386 years longer than the chronology preserved in the MT. These are not random variations. The numbers exhibit a systematic pattern rather than accidental copying mistakes, evidencing intentional revision rather than ordinary scribal errors (with a couple of exceptions).3
Different Numbers Produce Different Histories
The significance of these numerical differences cannot be overstated. If the Masoretic chronology is correct, Adam, the Flood, Babel, and Abraham all occurred much later than they would under the Septuagint chronology. Likewise, if the Septuagint preserves the original numbers, then the biblical timeline commonly accepted in most modern Bibles is incorrect and considerably shorter than Moses originally wrote. These competing chronologies affect the dating of virtually every major event recorded between creation and Abraham. Therefore, this is not merely an academic exercise involving obscure textual details. It concerns the historical framework of Scripture itself.
A Question of Preservation
Christians often focus on the doctrine of inspiration while giving relatively little attention to the doctrine of preservation. Inspiration concerns how God originally gave Scripture through the biblical authors. Preservation concerns how God has maintained His Word throughout history despite centuries of copying, translation, and manuscript transmission. Every Christian already assumes some doctrine of preservation. Whenever believers open their Bible expecting to read God’s authoritative Word, they implicitly trust that God has faithfully preserved His revelation.
The Bible itself repeatedly affirms God’s commitment to preserving His Word.4 However, Scripture does not specify the precise mechanism by which that preservation occurs. It does not state that every original reading will always survive exclusively in Hebrew manuscripts. Nor does it guarantee that every later manuscript will be entirely free from human mistakes. Instead, God’s providential preservation operates through multiple manuscript traditions. Consequently, the original reading in Genesis 5 and 11 could theoretically be found in the Masoretic Text, the Samaritan Pentateuch, the Septuagint, or even in all three traditions. The task of textual criticism does not undermine Scripture but instead identifies as accurately as possible the original inspired text that God has preserved through the manuscript tradition.
Ancient Witnesses to the Biblical Text
Ancient historical witnesses lived much closer to the original manuscripts than modern scholars and often had access to documents that no longer exist. Their testimony provides an important window into the history of the biblical text and helps answer the central question of our podcast: which chronology reflects the original text of Genesis? Textual criticism need not rely solely upon surviving biblical manuscripts. Instead, scholars should also examine ancient historians, church fathers, translators, and chronologists who quoted or summarized the genealogies. These writers often possessed biblical manuscripts that have since disappeared. Although their copies no longer exist, their quotations and chronological calculations serve as historical “snapshots” of earlier forms of the biblical text.
Translating poetry, idioms, or complex theological language from Hebrew into Greek can be difficult because translators must make interpretive decisions. Numbers, however, are much simpler. A statement such as “Adam lived 930 years” or “Seth was born when Adam was 230 years old” requires almost no interpretive judgment. Numerical values translate directly from one language into another. Consequently, when ancient witnesses consistently record particular numbers, scholars can have considerable confidence that those figures reflect the manuscripts those writers possessed. This considerably reduces many of the interpretive complications normally associated with textual criticism.
This approach can be likened to a forensic investigation. Rather than depending on a single witness, the investigator assembles testimony from numerous independent sources and compares their agreement with one another. Each witness contributes another piece to the historical puzzle.
Eusebius and the Earliest Systematic Comparison
The first major historical witness in our discussion is Eusebius of Caesarea, the fourth-century church historian and chronologist. Eusebius was the first known writer to systematically document the divergent numbers found in Genesis 5 and 11. Writing in the early fourth century, Eusebius compared the various textual traditions and recognized that substantial differences existed between them. Importantly, he did not simply observe the discrepancies. He attempted to explain them and determine which chronology was original.
Eusebius had access to manuscripts that no longer survive. Living only a few centuries after the apostolic era, he possessed resources unavailable to modern scholars. His chronological work therefore provides valuable evidence concerning the state of the biblical text during late antiquity. Even more significant are Eusebius’s own chronological calculations. He carefully added the genealogical numbers, calculated the elapsed years between major biblical events, and recorded his conclusions. These internal calculations allow modern researchers to verify that his manuscripts contained the same numbers he reported. This makes Eusebius an exceptionally reliable witness because his calculations function as an internal check on the accuracy of the transmitted text.
Josephus: A First-Century Witness
Flavius Josephus occupies a unique position because he wrote during the first century, only decades after the destruction of Jerusalem in AD 70. Originally a Jewish commander during the Jewish revolt against Rome, Josephus eventually came under Roman patronage and composed several important historical works, including The Jewish War, Against Apion, and Antiquities of the Jews.
It is Antiquities that becomes especially significant. In this massive historical work, Josephus recounts biblical history beginning with Adam and continuing through Israel’s later history. Along the way, he reproduces many of the numbers from Genesis 5 and 11. Even more importantly, Josephus performs his own chronological calculations. He adds the years between generations, calculates the time from Adam to the Flood, from the Flood to Abraham, and ultimately constructs a comprehensive chronology of biblical history.
Josephus has generated considerable scholarly debate. Some surviving manuscripts of Josephus contain conflicting numerical readings, requiring careful analysis to determine what Josephus originally wrote. After examining both the manuscript tradition and modern scholarly analyses, I have concluded that Josephus consistently supports the longer chronology represented by the Septuagint. Josephus appears to have possessed a Hebrew manuscript whose numbers agreed with the Septuagint rather than with the Masoretic Text. This conclusion carries substantial weight because Josephus wrote centuries before the Masoretic manuscripts currently used for most modern Bible translations. His testimony therefore represents independent evidence that the longer chronology already existed within Hebrew textual tradition during the first century.
One particularly striking observation concerns Josephus’ overall chronology. Josephus states that the period from Adam to the Persian king Artaxerxes encompasses approximately five thousand years of history. Such a calculation cannot be obtained using the shorter Masoretic chronology. Instead, it aligns naturally with the longer chronology deposited in the Septuagint. This broader framework further reinforces the conclusion that Josephus accepted the longer genealogy extending from Adam to Abraham. Far from treating the chronology as incidental, Josephus built his entire presentation of biblical history upon it.
Internal Evidence Within Scripture
The narratives surrounding Genesis 5/11 provide indirect evidence regarding the proper chronology. One example concerns the relationship between Abraham and the post-Flood patriarchs. Using the Masoretic chronology, Shem remains alive during much of Abraham’s lifetime. Indeed, several post-Flood patriarchs continue living for centuries while Abraham is alive.
This creates tension with the way Scripture describes Abraham. Genesis 25:7-8 portrays Abraham as “an old man and full of years” when he dies at the age of 175. If contemporaries in the Masoretic chronology were still living to four hundred or even five hundred years of age, would a man dying at 175 naturally be described as especially old? The description contradicts the context in which Abraham would have been living. By contrast, under the Septuagint chronology, Shem and the earlier patriarchs have died centuries before Abraham appears. Abraham therefore truly belongs to a later generation and naturally stands out as an elderly patriarch within his own historical setting.
Moreover, using the Masoretic chronology, only about 350 years separate the Flood from Abraham. Within this relatively brief period, Scripture already describes complex civilizations, organized kingdoms, large populations, military coalitions, and established political structures. Genesis records kings ruling multiple regions, international conflicts, and substantial urban development.
Can such rapid social, political, and demographic development fit comfortably within only three and a half centuries following the Flood and the dispersion at Babel? The Septuagint chronology provides approximately 1,100 years between the Flood and Abraham. This longer interval allows considerably more time for population growth, city development, nation formation, and political organization. This harmonizes more naturally with the historical setting depicted in Genesis. The descriptions of aging, population growth, established kingdoms, and post-Flood civilization all seem more consistent with an interval exceeding one thousand years rather than only three hundred and fifty.
Taken together with the manuscript evidence, the testimony of Josephus, Eusebius, and the Samaritan Pentateuch increasingly points toward the originality of the longer chronology preserved in the Septuagint.
Every Theory Requires Someone to Have Changed the Text
If the numbers were deliberately altered, who changed them, when were they changed, and what motivation could have been powerful enough to justify altering a text regarded as the very Word of God? These questions move beyond simple textual comparison into historical reconstruction. Consequently, we survey several competing theories before presenting the explanation that best accounts for the evidence.
Regardless of which textual tradition one believes contains the original numbers, every position necessarily requires that someone altered the text. If the Masoretic Text contains the original chronology, then the longer chronology found in the Septuagint and much of the Samaritan Pentateuch must have originated through deliberate alteration. Someone must have increased many of the patriarchs’ ages by one hundred years. Conversely, if the Septuagint contains the original chronology, then the shorter Masoretic chronology must represent a later revision in which approximately 1,250 years were removed from biblical history. There is no neutral position.
The Egyptian Chronology Theory
According to this view, the translators of the Septuagint deliberately lengthened the chronology in order to make biblical history appear more compatible with the much longer histories used by ancient Egyptian historians. At first glance, the reasoning seems straightforward. The Septuagint was translated in Alexandria, Egypt, during the Hellenistic period. The translators lived within an intellectual environment that valued ancient history and possessed extensive Egyptian king lists and chronological records. It has therefore been suggested that Jewish translators expanded the biblical chronology to avoid making Scripture appear too recent when compared with Egyptian civilization.
This theory has been repeated so frequently in scholarly literature that many readers simply assume it must be correct. When I began my own research, I initially accepted this explanation as well. However, instead of repeating the traditional argument, I decided to examine the actual chronological evidence from ancient Egypt. Accordingly, I investigated the chronological systems known in Egypt during the Hellenistic period.
The Egyptian chronological traditions were not merely somewhat longer than the Septuagint chronology—they were dramatically longer. If Jewish translators had truly intended to harmonize Scripture with Egyptian history, adding approximately 1,250 years would have accomplished very little. Egyptian civilization was believed to extend thousands of years beyond even the longer biblical chronology.
Indeed, if conformity to Egyptian chronology had been the translators’ objective, there would have been little reason to stop after adding only one hundred years to selected patriarchs. They could easily have extended the chronology by several thousand additional years, particularly in the antediluvian epoch. The chronology in the Septuagint remains far too short to accomplish the supposed purpose of harmonizing Scripture with Egyptian historical claims.
Additionally, there is no direct historical evidence demonstrating that the Jewish translators in Alexandria felt pressured to modify Scripture in order to satisfy Egyptian historical traditions. The Septuagint itself contains no obvious evidence of Egyptian theology or ideology influencing its translation of Genesis. Nor do surviving Jewish writings from Alexandria indicate widespread concern about defending biblical chronology against Egyptian historical records. The commonly repeated explanation rests largely upon speculation rather than documentary evidence.
The Patriarchal Overlap Theory
According to the Masoretic chronology, several post-Flood patriarchs—including Shem—remain alive during Abraham’s lifetime. Some scholars have regarded this extensive overlap as historically awkward or aesthetically undesirable. The proposed solution is that later scribes expanded the chronology in order to spread the patriarchs farther apart chronologically. By increasing the ages at which they fathered their sons, the overlap disappears and successive generations become separated more naturally.
This explanation initially appears plausible. The gradual decline in human lifespan recorded in the Septuagint certainly produces a smoother historical progression. Nevertheless, the theory encounters serious difficulties. The greatest problem is that the patriarchal overlap theory must explain not only the Septuagint but also the Samaritan Pentateuch.
In Genesis 11, both textual traditions preserve many of the same larger begetting ages. Yet the Samaritan community and the Jewish community had become deeply divided centuries before the time of Christ. The New Testament itself reflects the profound hostility that existed between Jews and Samaritans. Historically, the Jewish destruction of the Samaritan temple on Mount Gerizim intensified this hostility even further. Given this separation, Smith asks how two independent religious communities could have coordinated identical chronological revisions if the changes occurred after their traditions diverged. Any satisfactory explanation must account for both textual traditions simultaneously.
The Rabbinic Deflation Hypothesis
When I first encountered the proposal that the shorter chronology originated within rabbinic Judaism after the destruction of the Jerusalem Temple, I rejected it almost immediately. Like many conservative evangelicals, I have enormous respect for the Jewish scribal tradition. The extraordinary care with which Jewish scribes copied the Hebrew Scriptures seemed incompatible with the deliberate alteration of sacred chronology. Initially, the proposal sounded implausible and even conspiratorial. I resisted it for approximately a year while continuing to investigate the evidence.
Only after examining numerous ancient sources did I gradually conclude that the historical data consistently pointed in that direction. My change of mind therefore did not arise from theological preference but from cumulative historical evidence. One historical event repeatedly emerges as a decisive turning point: the destruction of Jerusalem and its Temple in AD 70. This catastrophe fundamentally transformed Judaism. The Temple—the center of Jewish worship—was gone. The priesthood ceased functioning. The Sadducees largely disappeared. The Pharisees and their rabbinic successors increasingly assumed leadership over Jewish religious life. At the same time, Christianity was expanding rapidly throughout the Roman Empire. Large numbers of Jews accepted Jesus as the promised Messiah, while many others rejected those claims. This unique historical setting created circumstances unlike any earlier period in Jewish history.
Following the destruction of Jerusalem and subsequent Jewish revolts against Rome, many earlier textual communities disappeared. The Dead Sea Scroll community had already been destroyed. Their manuscripts remained hidden for nearly two thousand years. The surviving Hebrew textual tradition increasingly came under rabbinic control. The rabbis possessed both the authority and the opportunity to standardize the Hebrew text during this period.
The key to understanding the chronology lies in what ancient writers called “Messianic chronology.” During the centuries leading up to the birth of Christ, many Jewish interpreters attempted to calculate the time of the Messiah’s arrival. These calculations drew upon numerous biblical passages, including Daniel’s prophecy of the seventy weeks and the genealogical chronology of Genesis 5 and 11. The expectation of an approaching Messiah permeated Jewish literature during the Second Temple period. The New Testament itself reflects this atmosphere of anticipation. People repeatedly ask whether John the Baptist, Jesus, or others might be the promised Messiah.
Chronological calculations formed one component of these broader expectations. Messianic chronology became a point of controversy between Christians and rabbinic Judaism. Early Christians proclaimed that Jesus had appeared precisely when biblical chronology anticipated the Messiah. Rabbinic teachers rejected this conclusion. Ancient Christian writers, particularly Justin Martyr, describe vigorous debates with Jewish leaders over the identity of the Messiah and timing of his arrival. In his work Dialogue with Trypho, Justin accuses Jewish teachers of traveling throughout the Mediterranean world to refute Christian claims concerning Jesus. Chronological arguments formed part of this larger apologetic conflict. Shortening the chronology by approximately 1,250 years would significantly alter chronological calculations concerning the expected arrival of the Messiah.
Within this historical context, I argue that a powerful theological motivation existed for revising the chronology. My proposal concerns certain rabbinic leaders during a specific historical period rather than the Jewish people as a whole. I explicitly reject interpreting the evidence as ethnic hostility or antisemitism. Instead, it was an intense religious controversy occurring during the formative years of rabbinic Judaism and early Christianity. Historical circumstances, theological motivation, and control over the manuscript tradition converged during this period in a manner unmatched elsewhere in Jewish history.
After examining the manuscript traditions, ancient historians, church fathers, internal biblical evidence, and the broader historical setting of early Judaism and Christianity, I believe the cumulative evidence strongly favors the originality of the longer chronology recorded in the Septuagint. Accordingly, the shorter chronology represented by the Masoretic Text most likely originated through deliberate revision during the early rabbinic period, probably in the decades following the destruction of the Jerusalem Temple.5
Endnotes
- “Wild West Evangelical Hermeneutics (Part Three): The Patriarchal Lifespans.” Bible and Spade 35, no. 3/4 (Summer/Fall 2022): 42–52. ↩︎
- “MT, SP, or LXX? Deciphering a Textual and Chronological Conundrum in Genesis 5,” Bible and Spade 31, no. 1 (Winter 2018): 18–27. ↩︎
- “The Case for the Septuagint’s Chronology in Genesis 5 and 11,” in Proceedings of the Eighth International Conference on Creationism, ed. John H. Whitmore (International Conference on Creationism, Pittsburgh, PA: Creation Science Fellowship, 2018), 117–32 ↩︎
- See my video presentation, “The Transmission and Preservation of Scripture.” ↩︎
- “Setting the Record Straight on the Primeval Chronology of the Septuagint: A Response to Cosner and Carter.” Bible and Spade 31, no. 4 (Fall 2018): 114–133. ↩︎
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