Deuteronomy 4:41-43

Moses said, “People of Israel, you must set aside the following three towns east of the Jordan River as Safe Towns: Bezer in the desert highlands belonging to the Reuben tribe; Ramoth in Gilead, belonging to the Gad tribe; and Golan in Bashan, belonging to the Manasseh tribe. If you kill a neighbor without meaning to, and if you had not been angry with that person, you can run to one of these towns and find safety.”