Numbers 35:27 in the World English Bible
and the avenger of blood finds him outside of the border of his city of refuge, and the avenger of blood kills the man slayer, he shall not be guilty of blood,
Context
26 But if the slayer shall at any time come without the border of the city of his refuge, whither he was fled;
27 And the revenger of blood find him without the borders of the city of his refuge, and the revenger of blood kill the slayer; he shall not be guilty of blood:
28 Because he should have remained in the city of his refuge until the death of the high priest: but after the death of the high priest the slayer shall return into the land of his possession.