Deuteronomy 19:4-6

CAB(i) 4 And this shall be the ordinance of the manslayer who shall flee there, and shall live, whosoever has killed his neighbor ignorantly, seeing that he did not hate him in times past. 5 And whoever shall enter with his neighbor into the thicket, to gather wood, if the hand of him that cuts wood with the ax should be violently shaken, and the axhead should fall off from the handle and strike his neighbor, and he should die, then he shall flee to one of these cities, and live. 6 Lest the avenger of blood pursue after the manslayer, because his heart is hot, and overtake him, if the way be too long, and kill him, though there is to this man no sentence of death, because he did not hate him in times past.