Genesis 4:24

Overview - Genesis 4
1	The birth, occupation, and offering of Cain and Abel.
8	Cain murders his brother Abel.
11	The curse of Cain.
17	Has a son called Enoch, and builds a city, which he calls after his name.
18	His descendants, with Lamech and his two wives.
25	The birth of Seth,
26	and Enos.

Genesis 4:24  (King James Version)
If Cain shall be avenged sevenfold, truly Lamech seventy and sevenfold.