Genesis 6:1

VI.

(1) When men (the adam) began to multiply. — The multiplication of the race of Adam was probably comparatively slow, because of the great age to which each patriarch attained before his first-born was brought into the world: though, as the name given is not necessarily that of the eldest, but of the son who enjoyed the birthright, it does not follow that in every case the one named was absolutely the eldest son. There may have been other substitutions besides that of Seth for Cain; and Noah, born when his father was 182 years of age, seems a case in point. He was selected to be the restorer of mankind because of his piety, and may have had many brothers and sisters older than himself. Each patriarch, however, begat “sons and daughters,” and as we find Cain building a city, he must have seen, at all events, the possibility of a considerable population settling round him. It was probably, as we saw above, about the time of Enoch that the corruption of the family of Adam began to become general.