But if the manslayer ever goes outside the limits of the city of refuge to which he fled

Numbers 35:25
The assembly is to protect the manslayer from the hand of the avenger of blood. Then the assembly will return him to the city of refuge to which he fled, and he must live there until the death of the high priest, who was anointed with the holy oil.

Numbers 35:27
and the avenger of blood finds him outside of his city of refuge and kills him, then the avenger will not be guilty of bloodshed

But if the slayer shall at any time come without the border of the city of his refuge, where he was fled;