Numbers 35:10-15

10“1Speak to the sons of Israel and say to them, ‘When you cross the Jordan into the land of Canaan, 112then you shall select for yourselves cities to be your 3cities of refuge, so that the one who commits manslaughter by 4killing a person 5unintentionally may flee there. 126The cities shall 7serve you as a refuge from the avenger, so that the one who commits manslaughter does not die until he stands before the congregation for 8trial. 13So the cities which you are to provide shall be six cities of refuge for you. 14You 9shall provide three cities across the Jordan, and three cities 10in the land of Canaan; they are to be cities of refuge. 15These six cities shall be a refuge for the sons of Israel, for the stranger, and for the foreign resident among them; so that anyone who 11kills a person 12unintentionally may flee there.