This is the case of the manslayer, that shall flee there and live: whoever kills his neighbor unawares, and didn’t hate him in time past; as when a man goes into the forest with his neighbor to chop wood, and his hand fetches a stroke with the axe to cut down the tree, and the head slips from the handle, and lights on his neighbor, so that he dies; he shall flee to one of these cities and live:  Deuteronomy 19:4-5