Genesis 4:23-24
Genesis 4:23-24 ASV
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 for wounding me, And a young man for bruising me: If Cain shall be avenged sevenfold, Truly Lamech seventy and sevenfold.