Numbers 35:9-15 New Revised Standard Version (NRSV)
Cities of Refuge
9 The Lord spoke to Moses, saying: 10 Speak to the Israelites, and say to them: When you cross the Jordan into the land of Canaan, 11 then you shall select cities to be cities of refuge for you, so that a slayer who kills a person without intent may flee there. 12 The cities shall be for you a refuge from the avenger, so that the slayer may not die until there is a trial before the congregation.
13 The cities that you designate shall be six cities of refuge for you: 14 you shall designate three cities beyond the Jordan, and three cities in the land of Canaan, to be cities of refuge. 15 These six cities shall serve as refuge for the Israelites, for the resident or transient alien among them, so that anyone who kills a person without intent may flee there.