'Avenger of Blood' in the Bible

that the slayer who unwittingly without intent smiteth any one mortally may flee thither: and they shall be your refuge from the avenger of blood.

And if the avenger of blood pursue after him, they shall not deliver the slayer up into his hand; for he smote his neighbour unwittingly, and hated him not previously.

These were the cities appointed for all the children of Israel, and for the stranger that sojourneth among them, that whosoever smiteth any one mortally without intent might flee thither, and not die by the hand of the avenger of blood, until he stood before the assembly.