Deuteronomy

These six cities shall be a refuge, both for the children of Israel, and for the stranger, and for the sojourner among them: that every one that killeth any person unawares may flee thither.

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

That the slayer might flee thither, which should kill his neighbour unawares, and hated him not in times past; and that fleeing unto one of these cities he might live:

Then said she, I pray thee, let the king remember the Lord thy God, that thou wouldest not suffer the revengers of blood to destroy any more, lest they destroy my son. And he said, As the Lord liveth, there shall not one hair of thy son fall to the earth.