24 For seven fold vengeance was to be taken for Cain; "But for Lamech will be taken seventy times seven."
Genesis 4:24 Cross References - Thomson
Genesis 4:15
15 And the Lord said to him, "Not so. Whosoever killeth Cain shall suffer seven fold vengeance." And the Lord God gave a sign to Cain, that whoever found him would not kill him.
Matthew 18:22
22 Jesus saith to him, I do not say to thee seven times, but seventy times seven.