'Avenger' in the Bible

The blood avenger himself will put the killer to death; he must put him to death when meeting him.

then the community will judge between the striker and between the blood avenger according to these ordinances.

The community will deliver the killer from the hand of the blood avenger, and the community will restore him to the city of his refuge to which he fled; and he will live there in it until the death of the high priest who was anointed with holy oil.

and the blood avenger finds him outside the territory of the city of his refuge, and the blood avenger kills the killer, {he will not be guilty of blood}