Deuteronomy 4:43

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,