'Seven fold' in the Bible

Then Yahweh said to him, "Therefore, whoever kills Cain will be avenged sevenfold." Then Yahweh put a sign on Cain so that whoever found him would not kill him.

If Cain is avenged sevenfold, Then Lamech [will be avenged] seventy and seven [times].

And return to our neighbors sevenfold {upon them} their taunts [with] which they taunted you, O Lord.

But [if] he is found, he will pay sevenfold, every possession of his house he shall give.

And the light of the full moon will be like the light of the sun, and the light of the sun will be sevenfold, like the light of seven days, on [the] day [when] Yahweh binds up the breakage of his people, and he heals the wound of his blow.