Joshua 20
Young's Literal Translation (YLT)
3 for the fleeing thither of a man-slayer smiting life inadvertently, without knowledge; and they have been to you for a refuge from the redeemer of blood.
World English Bible (WEB)
3 that the manslayer who kills any person unwittingly [and] unawares may flee there: and they shall be to you for a refuge from the avenger of blood.