Deuteronomy 19:5-7

21st Century King James Version

⁵ as when a man goeth into the wood with his neighbor to hew wood, and his hand fetcheth a stroke with the ax to cut down the tree, and the head slippeth from the helve and lighteth upon his neighbor, so that he die — he shall flee unto one of those cities and live,

⁶ lest the avenger of the blood pursue the slayer while his heart is hot and overtake him, because the way is long, and slay him, whereas he was not worthy of death, inasmuch as he hated him not in time past.

⁷ Therefore I command thee, saying, ‘Thou shalt separate three cities for thee.’