Genesis 4:15 And the Lord said unto him, Therefore whosoever slayeth Cain, vengeance shall be taken on him sevenfold. And the Lord set a mark upon Cain, lest any finding him should kill him. 12 I MC VC

Genesis 4:24 If Cain shall be avenged sevenfold, truly Lamech seventy and sevenfold. 10 I MC VC