Numbers 35:15 in the World English Bible
These six cities shall be refuge for the children of Israel, for the stranger, and for the foreigner living among them, that everyone who kills any person unwittingly may flee there.
Context
14 Ye shall give three cities on this side Jordan, and three cities shall ye give in the land of Canaan, which shall be cities of refuge.
15 These six cities shall be a refuge, both for the children of Israel, and for the stranger, and for the sojourner among them: that every one that killeth any person unawares may flee thither.
16 And if he smite him with an instrument of iron, so that he die, he is a murderer: the murderer shall surely be put to death.