Deuteronomy 4:41-49

Then Moses set aside three towns in the country on the east side of the Jordan to which someone who had unintentionally killed a person could flee and find refuge. If the murder was unintentional and there was no history of bad blood, the murderer could flee to one of these cities and save his life: Bezer in the wilderness on the tableland for the Reubenites, Ramoth in Gilead for the Gadites, and Golan in Bashan for the Manassites. * * * This is the Revelation that Moses presented to the People of Israel. These are the testimonies, the rules and regulations Moses spoke to the People of Israel after their exodus from Egypt and arrival on the east side of the Jordan in the valley near Beth Peor. It was the country of Sihon king of the Amorites who ruled from Heshbon. Moses and the People of Israel fought and beat him after they left Egypt and took his land. They also took the land of Og king of Bashan. The two Amorite kings held the country on the east of the Jordan from Aroer on the bank of the Brook Arnon as far north as Mount Siyon, that is, Mount Hermon, all the Arabah plain east of the Jordan, and as far south as the Sea of the Arabah (the Dead Sea) beneath the slopes of Mount Pisgah.