Genesis 4:15
4:15 But the Lord said to him, “All right then, if anyone kills Cain, Cain will be avenged seven times as much.” Then the Lord put a special mark on Cain so that no one who found him would strike him down.
Genesis 4:24
4:24 If Cain is to be avenged seven times as much,
then Lamech seventy-seven times!”