5:25-32 Methuselah signifies, 'he dies, there is a dart,' 'a sending forth,' namely, of the deluge, which came the year that Methuselah died. He lived 969 years, the longest that any man ever lived on earth; but the longest liver must die at last. Noah signifies rest; his parents gave him that name, with a prospect of his being a great blessing to his generation. Observe his father's complaint of the calamitous state of human life, by the entrance of sin, and the curse of sin. Our whole life is spent in labour, and our time filled up with continual toil. God having cursed the ground, it is as much as some can do, with the utmost care and pains, to get a hard livelihood out comfort us. It signifies not only that desire and expectation which parents generally have about their children, that they will be comforts to them and helpers, though they often prove otherwise; but it signifies also a prospect of something more. Is Christ ours? Is heaven ours? We need better comforters under our toil and sorrow, than the dearest relations and the most promising offspring; may we seek and find comforts in Christ.
And all the days of Lamech were seven hundred seventy and seven years, and he died. According to the Greek version, he lived but seven hundred and fifty three; and according to the Samaritan version, only six hundred and fifty three: but it is best and safest in these, and all the above numbers, to follow the original Hebrew, and the numbers in that, with which the Targum of Onkelos exactly agrees, written about the time of Christ; and these numbers were just the same when the two Talmuds were composed. Some of the Jewish writers, and so some Christians, confound this Lamech with the other Lamech, who was of the race of Cain, spoken of in the preceding chapter, and say he was a bigamist and a murderer; and that in his days sins were committed openly, and witchcraft was throughout the whole world (e): he died, according to Bishop Usher, A. M. 1651. Eight times in this chapter the phrase is used, "and he died", to put us in mind of death; to observe that it is the way of all flesh; that those that live longest die at last, and it must be expected by everyone.
(e) Shalshalet Hakabal, fol. 1. 2. & 74. 2.