Deuteronomy 4:41-49

Then Moses set apart three cities of refuge east of the Jordan River. Anyone who killed another person unintentionally, without previous hostility, could flee there to live in safety. These were the cities: Bezer on the wilderness plateau for the tribe of Reuben; Ramoth in Gilead for the tribe of Gad; Golan in Bashan for the tribe of Manasseh. This is the body of instruction that Moses presented to the Israelites. These are the laws, decrees, and regulations that Moses gave to the people of Israel when they left Egypt, and as they camped in the valley near Beth-peor east of the Jordan River. (This land was formerly occupied by the Amorites under King Sihon, who ruled from Heshbon. But Moses and the Israelites destroyed him and his people when they came up from Egypt. Israel took possession of his land and that of King Og of Bashan—the two Amorite kings east of the Jordan. So Israel conquered the entire area from Aroer at the edge of the Arnon Gorge all the way to Mount Sirion, also called Mount Hermon. And they conquered the eastern bank of the Jordan River as far south as the Dead Sea, below the slopes of Pisgah.)