And all the days of Lamech were seven hundred seventy and seven years: and he died.
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George Leo Haydock
Old. It is wonderful if Noe had no children before this time; but he might have had many, whom the Scripture does not mention, either because they were dead before the deluge, or taking evil courses with the daughters of men, deserved to perish with them. Noe kept the three, who were born after God had foretold the deluge, with the greatest care, under his own eyes. St. Augustine (City of God xv. 20.) thinks, however, that many of the Patriarchs had no children till they were pretty far advanced in years. As Sem was born when Noe was 502, and Cham was the youngest, Japheth must have been the first-born. Compare chap. x. 21, with chap. ix. 24. There is no reason to suppose they were all born the same year. (Calmet)