Numbers 35:12

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.

15 For the children of Israel, and for the stranger and for the sojourner among them, shall these six cities be for refuge; that everyone who kills any person unwittingly may flee there.