Deuteronomy 4:43

39Know therefore today, and take it to heart, that the LORD himself is God in heaven above and on the earth beneath. There is no one else.

40You shall keep his statutes and his commandments which I command you today, that it may go well with you and with your children after you, and that you may prolong your days in the land which the LORD your God gives you for all time.

41Then Moses set apart three cities beyond the Jordan toward the sunrise,

42that the man slayer might flee there, who kills his neighbor unintentionally and didn’t hate him in time past, and that fleeing to one of these cities he might live:

43Bezer in the wilderness, in the plain country, for the Reubenites; and Ramoth in Gilead for the Gadites; and Golan in Bashan for the Manassites.

44This is the law which Moses set before the children of Israel.

45These are the testimonies, and the statutes, and the ordinances which Moses spoke to the children of Israel when they came out of Egypt,

46beyond the Jordan, in the valley opposite Beth Peor, in the land of Sihon king of the Amorites, who lived at Heshbon, whom Moses and the children of Israel struck when they came out of Egypt.

47They took possession of his land and the land of Og king of Bashan, the two kings of the Amorites, who were beyond the Jordan toward the sunrise;