These are the generations of Shem: Shem was a hundred years old, and begat Arpachshad two years after the flood:
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Augustine of Hippo
AD 430
It is necessary, therefore, to preserve the series of generations descending from Shem, for the sake of exhibiting the city of God after the flood. As before the flood it was exhibited in the series of generations descending from Seth, now it is descending from Shem. And therefore does divine Scripture, after exhibiting the earthly city as Babylon or “Confusion,” revert to the patriarch Shem and recapitulate the generations from him to Abraham, specifying the year in which each father gave birth to the son that belonged to this line and how long he lived. And unquestionably it is this that fulfills the promise I made, that it should appear why it is said of the sons of Eber, “The name of the one was Peleg, for in his days the earth was divided.” For what can we understand by the division of the earth, if not the diversity of languages? And, therefore, omitting the other sons of Shem, who are not concerned in this matter, Scripture gives the genealogy of those by whom the line runs on to Abraham, as before the flood those are given who carried on the line to Noah from Seth. Accordingly this series of generations begins thus: “These are the generations of Shem: Shem was a hundred years old and begat Arpachshad two years after the flood. And Shem lived after he begat Arpachshad five hundred years and begat sons and daughters.” In like manner it registers the rest, naming the year of his life in which each begat the son who belonged to that line that extends to Abraham. It specifies, too, how many years he lived thereafter, begetting sons and daughters, that we may not childishly suppose that the men named were the only men, but that we may understand how the population increased and how regions and kingdoms so vast could be populated by the descendants of Shem. Especially this is true of the kingdom of Assyria, from which Ninus subdued the surrounding nations, reigning with brilliant prosperity and bequeathing to his descendants a vast but thoroughly consolidated empire, which held together for many centuries.
