Deuteronomy 4:40-49

40 Keep his statutes and his commandments, which I am commanding you today for your own well-being and that of your descendants after you, so that you may long remain in the land that the Lord your God is giving you for all time.
41 Then Moses set apart on the east side of the Jordan three cities
42 to which a homicide could flee, someone who unintentionally kills another person, the two not having been at enmity before; the homicide could flee to one of these cities and live:
43 Bezer in the wilderness on the tableland belonging to the Reubenites, Ramoth in Gilead belonging to the Gadites, and Golan in Bashan belonging to the Manassites.
44 This is the law that Moses set before the Israelites.
45 These are the decrees and the statutes and ordinances that Moses spoke to the Israelites when they had come out of Egypt,
46 beyond the Jordan in the valley opposite Beth-peor, in the land of King Sihon of the Amorites, who reigned at Heshbon, whom Moses and the Israelites defeated when they came out of Egypt.
47 They occupied his land and the land of King Og of Bashan, the two kings of the Amorites on the eastern side of the Jordan:
48 from Aroer, which is on the edge of the Wadi Arnon, as far as Mount Sirion (that is, Hermon),
49 together with all the Arabah on the east side of the Jordan as far as the Sea of the Arabah, under the slopes of Pisgah.

Footnotes 1

New Revised Standard Version Bible, copyright 1989, Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.