'Avenger of Blood' in the Bible

the avenger of blood, he shall put the murderer to death; when he meeteth him, he shall put him to death.

or from enmity smite him with his hand, so that he die, he that smote him shall certainly be put to death; he is a murderer: the avenger of blood shall put the murderer to death, when he meeteth him. --

then the assembly shall judge between the smiter and the avenger of blood according to these judgments;

and the assembly shall rescue the manslayer out of the hand of the avenger of blood, and the assembly shall restore him to the city of his refuge, whither he had fled; and he shall abide in it until the death of the high-priest, who was anointed with the holy oil.

and the avenger of blood find him outside the limits of his city of refuge, and the avenger of blood kill the manslayer, there shall be no blood-guiltiness upon him;