4:20. And Ada brought forth Jabel: who was the father of such as dwell in tents, and of herdsmen.
4:21. And his brother's name was Jubal: he was the father of them that play upon the harp and the organs.
4:22. Sella also brought forth Tubalcain, who was a hammerer and artificer in every work of brass and iron. And the sister of Tubalcain was Noema.
4:23. And Lamech said to his wives Ada and Sella: Hear my voice, ye wives of Lamech, hearken to my speech: for I have slain a man to the wounding of myself, and a stripling to my own bruising.
I have slain a man, etc… It is the tradition of the Hebrews, that Lamech in hunting slew Cain, mistaking him for a wild beast; and that having discovered what he had done, he beat so unmercifully the youth, by whom he was led into that mistake, that he died of the blows.
4:24. Sevenfold vengeance shall be taken for Cain: but for Lamech seventy times sevenfold.
4:25. Adam also knew his wife again: and she brought forth a son, and called his name Seth, saying: God hath given me another seed for Abel, whom Cain slew.
4:26. But to Seth also was born a son, whom he called Enos: this man began to call upon the name of the Lord.
Began to call upon, etc… Not that Adam and Seth had not called upon God, before the birth of Enos; but that Enos used more solemnity in the worship and invocation of God.
Genesis Chapter 5