Genesis 4:15
15 Then the Lord said to him, “Not so! If anyone kills Cain, vengeance shall be taken on him vsevenfold.” And the Lord put a mark on Cain, lest any who found him should attack him.
Genesis 4:24
24 wIf Cain’s revenge is sevenfold,
then Lamech’s is xseventy-sevenfold.”
Leviticus 26:18
18 And if in spite of this you will not listen to me, then I will discipline you again sevenfold for your sins,
Proverbs 6:31
31 but lif he is caught, he will pay msevenfold;
he will give all the goods of his house.