Deuteronomy 19:3-5
New International Version
3 Determine the distances involved and divide into three parts the land the Lord your God is giving you as an inheritance, so that a person who kills someone may flee for refuge to one of these cities.
4 This is the rule concerning anyone who kills a person and flees there for safety—anyone who kills a neighbor unintentionally, without malice aforethought. 5 For instance, a man may go into the forest with his neighbor to cut wood, and as he swings his ax to fell a tree, the head may fly off and hit his neighbor and kill him. That man may flee to one of these cities and save his life.
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