Deuteronomy 19:2-9

2 ayou shall set apart three cities for yourselves in the land that the Lord your God is giving you to possess. 3You shall measure the distances
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and divide into three parts the area of the land that the Lord your God gives you as a possession, so that any manslayer can flee to them.

4This is the provision for cthe manslayer, who by fleeing there may save his life. If anyone kills his neighbor unintentionally without having hated him in the past 5as when someone goes into the forest with his neighbor to cut wood, and his hand swings the axe to cut down a tree, and the head slips from the handle and strikes his neighbor so that he dieshe may flee to one of these cities and live, 6lest dthe avenger of blood in hot anger pursue the manslayer and overtake him, because the way is long, and strike him fatally, though the man did not deserve to die, since he had not hated his neighbor in the past. 7Therefore I command you, You shall set apart three cities. 8 eAnd if the Lord your God enlarges your territory, fas he has sworn to your fathers, and ggives you all the land that he promised to give to your fathers 9provided you are careful to keep all this commandment, which I command you today, by loving the Lord your God and by walking ever in his wayshthen you shall add three other cities to these three,
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