Numbers 35:26-28

CAB(i) 26 But if the manslayer should in any way go out beyond the bounds of the city where he fled for refuge, 27 and the avenger of blood should find him outside the bounds of the city of his refuge, and the avenger of blood should kill the manslayer, he is not guilty. 28 For he ought to have remained in the city of refuge till the high priest died; and after the death of the high priest the manslayer shall return to the land of his possession.