Deuteronomy 19:6 WBT

⁴  And this [is] the case of the slayer, who shall flee thither, that he may live: Whoever killeth his neighbor ignorantly, whom he hated not in time past;

⁵  As when a man goeth into the wood with his neighbor to hew wood, and his hand maketh a stroke with the ax to cut down the tree, and the head slippeth from the helve, and falleth upon his neighbor, that he dieth: he shall flee to one of these cities, and live:

⁶  Lest the avenger of blood shall 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  Wherefore I command thee, saying, Thou shalt separate three cities for thee.

⁸  And if the LORD thy God shall enlarge thy limits, as he hath sworn to thy fathers, and give thee all the land which he promised to give to thy fathers;