Genesis 4:15 And Jehovah said to him, Therefore, whoever slayeth Cain, it shall be revenged sevenfold. And Jehovah set a mark on Cain, lest any finding him should smite him. (DBY)
Ezekiel 25:12 Thus says the Lord Yahweh: Because Edom has dealt against the house of Judah by taking vengeance, and has greatly offended, and revenged himself on them; (WEB KJV JPS ASV DBY WBS)