Numbers 35:22-25

Thomson(i) 22 But if on a sudden, not through malice aforethought, he hath pushed him down, or thrown any instrument at him, not from ambush, 23 nor with any stone by which he might be killed, or not seeing him, and it light upon him, and he die, and he was not his enemy, nor seeking to do him any injury, 24 the congregation shall judge between him who smote, and the avenger of blood, according to these rules of decision; 25 and the congregation shall deliver the slayer from the avenger of blood, and the congregation shall send him back to the city of his refuge, to which he fled; and he shall dwell there, till the death of the high priest, whom they have anointed with holy oil.