Numbers 35:22-28

22‘1But if he pushed him suddenly without enmity, or threw something at him without lying in wait, 23or with any 2deadly object of stone, and without seeing it dropped on him so that he died, while he was not his enemy nor seeking his injury, 24then 3the congregation shall judge between the slayer and the blood avenger according to these ordinances. 25The congregation shall deliver the manslayer from the hand of the blood avenger, and the congregation shall restore him to his city of refuge to which he fled; and he shall live in it until the death of the high priest who was anointed with the holy oil. 26But if the manslayer at any time goes beyond the border of his city of refuge to which he may flee, 27and the blood avenger finds him outside the border of his city of refuge, and the blood avenger kills the manslayer, he will not be guilty of blood 28because he should have remained in his city of refuge until the death of the high priest. But after the death of the high priest the manslayer shall return to the land of his possession.