Deuteronomy 4:41-43

Moses chose three cities east of the Jordan River, where a person who accidentally killed someone could go. If the person was not killed because of hatred, the murderer’s life could be saved by running to one of these cities. These were the cities: Bezer in the desert high plain was for the Reubenites; Ramoth in Gilead was for the Gadites; and Golan in Bashan was for the Manassites.