Deuteronomy 19:5-7

Young's Literal Translation

⁵ even he who cometh in with his neighbour into a forest to hew wood, and his hand hath driven with an axe to cut the tree, and the iron hath slipped from the wood, and hath met his neighbour, and he hath died -- he doth flee unto one of these cities, and hath lived,

⁶ lest the redeemer of blood pursue after the man-slayer when his heart is hot, and hath overtaken him (because the way is great), and hath smitten him -- the life, and he hath no sentence of death, for he is not hating him heretofore;

⁷ therefore I am commanding thee, saying, Three cities thou dost separate to thee.