Deuteronomy 4:41-43

41 Then Moses severed three cities on this side Jordan toward the sun rise;

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

43 Namely, Bezer in the wilderness, in the plain country, of the Reubenites; and Ramoth in Gilead, of the Gadites; and Golan in Bashan, of the Manassites.