Numbers 35:11

8 Concerning the cities which you shall give of the possession of the children of Israel, from the many you shall take many; and from the few you shall take few: everyone according to his inheritance which he inherits shall give of his cities to the Levites.

9 Yahweh spoke to Moses, saying,

10 Speak to the children of Israel, and tell them, When you pass over the Jordan into the land of Canaan,

11 then you shall appoint you cities to be cities of refuge for you, that the manslayer who kills any person unwittingly may flee there.

12 The cities shall be to you for refuge from the avenger, that the manslayer not die, until he stands before the congregation for judgment.

13 The cities which you shall give shall be for you six cities of refuge.

14 You shall give three cities beyond the Jordan, and three cities shall you give in the land of Canaan; they shall be cities of refuge.