Genesis 4:24

So Yahweh said to him, “Therefore whoever kills Cain, vengeance will be taken on him sevenfold.” And Yahweh appointed a sign for Cain, so that no one who found him would strike him.

Jesus *said to him, “I do not say to you, up to seven times, but up to seventy times seven.

so that upon you may fall the guilt of all the righteous blood shed on earth, from the blood of righteous Abel to the blood of Zechariah, the son of Berechiah, whom you murdered between the sanctuary and the altar.