Deuteronomy 4:41-43

ERV(i) 41 Then Moses separated three cities beyond Jordan toward the sunrising; 42 that the manslayer might flee thither, which slayeth his neighbour unawares, and hated him not in time past; and that fleeing unto one of these cities he might live: 43 [namely], Bezer in the wilderness, in the plain country, for the Reubenites; and Ramoth in Gilead, for the Gadites; and Golan in Bashan, for the Manassites.