Joshua 20:9

20:9 These were the appointed cities for all the children of Israel, and for the stranger who sojourns among them, that whoever kills any person unwittingly might flee there, and not die by the hand of the avenger of blood, until he stood before the congregation.
-World English Bible

Other Translation

20:9 These were the cities appointed for all the children of Israel, and for the stranger that sojourneth among them, that whosoever killeth [any] person at unawares might flee thither, and not die by the hand of the avenger of blood, until he stood before the congregation.
-King James Version