'Avenger of Blood' in the Bible

so that the person (manslayer) who kills any person unintentionally, without premeditation, may flee there, and they shall be your refuge from the blood avenger.

If the blood avenger pursues him, they shall not hand the offender (manslayer) over to him, because he killed his neighbor unintentionally and without premeditation and did not hate him beforehand.

These were the appointed cities for all the Israelites and for the stranger sojourning (living temporarily) among them, so that whoever killed any person unintentionally may flee there, and not die by the hand of the blood avenger until he had stood before the congregation [for judgment].