4:13. And Cain said to the Lord: My iniquity is greater than that I may deserve pardon.
4:14. Behold thou dost cast me out this day from the face of the earth, and from thy face I shall be hid, and I shall be a vagabond and a fugitive on the earth: every one therefore that findeth me, shall kill me.
Every one that findeth me shall kill me… His guilty conscience made him fear his own brothers and nephews; of whom, by this time, there might be a good number upon the earth; which had now endured near 130 years; as may be gathered from Gen. 5.3, compared with chap. 4.25, though in the compendious account given in the scriptures, only Cain and Abel are mentioned.
4:15. And the Lord said to him: No, it shall not so be: but whosoever shall kill Cain, shall be punished sevenfold. And the Lord set a mark upon Cain, that whosoever found him should not kill him.
Set a mark, etc… The more common opinion of the interpreters of holy writ supposes this mark to have been a trembling of the body; or a horror and consternation in his countenance.
4:16. And Cain went out from the face of the Lord, and dwelt as a fugitive on the earth at the east side of Eden.
4:17. And Cain knew his wife, and she conceived, and brought forth Henoch: and he built a city, and called the name thereof by the name of his son Henoch.
His wife… She was a daughter of Adam, and Cain's own sister; God dispensing with such marriages in the beginning of the world, as mankind could not otherwise be propagated. He built a city, viz… In process of time, when his race was multiplied, so as to be numerous enough to people it. For in the many hundred years he lived, his race might be multiplied even to millions.
4:18. And Henoch begot Irad, and Irad begot Maviael, and Maviael begot Mathusael, and Mathusael begot Lamech,
4:19. Who took two wives: the name of the one was Ada, and the name of the other Sella.