Deuteronomy 19:4-6

Brenton(i) 4 And this shall be the ordinance of the manslayer, who shall flee thither, and shall live, whosoever shall have smitten his neighbour ignorantly, whereas he hated him not in times past. 5 And whosoever shall enter with his neighbour into the thicket, to gather wood, if the hand of him that cuts wood with the axe should be violently shaken, and the axe head falling off from the handle should light on his neighbour, and he should die, he shall flee to one of these cities, and live. 6 Lest the avenger of blood pursue after the slayer, because his heart is hot, and overtake him, if the way be too long, and slay him, though there is to this man no sentence of death, because he hated him not in time past.