Joshua 20:9
These were the appointed cities for all the sons of Israel, and for the alien who was living in their midst, that he who had killed anyone without knowing might flee there, and not die by the hand of the avenger of blood, until he stood before the congregation.
Numbers 35:15
These six cities shall be a refuge for the sons of Israel, and for the stranger, and for anyone who stays among them, so that everyone who kills any person through error may flee there.
Joshua 20:4
And he shall flee to one of those cities, and shall stand at the entrance of the gate of the city, and shall declare his cause in the ears of the elders of that city. And they shall take him into the city to themselves and make him a place, and he shall live with them.
Joshua 20:6
And he shall live in that city until he stands before the congregation for judgment, until the death of the high priest who is in those days. Then the manslayer shall return and come to his city, and to his house, to the city from where he fled.