'Avenger of Blood' in the Bible

The avenger of blood himself shall slay the murderer: when he meets him, he shall slay him.

Or in enmity strikes him with his hand, that he dies: he that struck him shall surely be put to death; for he is a murderer: the avenger of blood shall slay the murderer, when he meets him.

Then the congregation shall judge between the slayer and the avenger of blood according to these judgments:

And the congregation shall deliver the slayer out of the hand of the avenger of blood, and the congregation shall restore him to the city of his refuge, where 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 finds him outside the borders of the city of his refuge, and the avenger of blood kills the slayer; he shall not be guilty of blood:

Lest the avenger of blood pursue the manslayer, while his anger is hot, and overtake him, because the way is long, and slay him; whereas he was not worthy of death, inasmuch as he hated the victim not in time past.

Then the elders of his city shall send and bring him from there, and deliver him into the hand of the avenger of blood, that he may die.

That the slayer that kills any person accidentally and unintentionally may flee there: and they shall be your refuge from the avenger of blood.

And if the avenger of blood pursues after him, then they shall not deliver the slayer up into his hand; because he struck his neighbor unintentionally, and hated him not beforehand.

These were the cities appointed for all the children of Israel, and for the stranger that sojourns among them, that whosoever kills any person accidentally might flee there, and not die by the hand of the avenger of blood, until he stood before the congregation.