Deuteronomy 4:42

42that athe manslayer might flee there, anyone who kills his neighbor unintentionally, without being at enmity with him in time past; he may flee to one of these cities and save his life:

Deuteronomy 19:4-5

4This is the provision for bthe 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,
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