Genesis 4:23-25

And Lamech said unto his wives, Adah and Zillah, Hear my voice; Ye wives of Lamech, hearken unto my speech: For I have slain a man to my wounding, And a young man to my hurt. If Cain shall be avenged sevenfold, Truly Lamech seventy and sevenfold. And Adam knew his wife again; and she bare a son, and called his name Seth: For God, said she, hath appointed me another seed instead of Abel, whom Cain slew.