Joshua 20:8-9

8And beyond the Jordan from Jericho eastward, they assigned Bezer in the wilderness, in the plateau, out of the tribe of Reuben, and Ramoth in Gilead out of the tribe of Gad, and Golan in Bashan of the tribe of Manasseh. 9These were the cities appointed for all the children of Israel, and for the stranger that sojourneth among them, that whosoever smiteth any one mortally without intent might flee thither, and not die by the hand of the avenger of blood, until he stood before the assembly.