Numbers 35
11 Ref then you shall appoint you cities to be cities of refuge for you, that the manslayer who kills any person unwittingly may flee there.
12 Ref The cities shall be to you for refuge from the avenger, that the manslayer not die, until he stands before the congregation for judgment.
13 The cities which you shall give shall be for you six cities of refuge.
14 Ref You shall give three cities beyond the Jordan, and three cities shall you give in the land of Canaan; they shall be cities of refuge.
15 Ref For the children of Israel, and for the stranger and for the foreigner living among them, shall these six cities be for refuge; that everyone who kills any person unwittingly may flee there.