Numbers 35:24-27

MSB(i) 24 then the congregation must judge between the slayer and the avenger of blood according to these ordinances. 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. 26 But if the manslayer ever goes outside the limits of the city of refuge to which he fled 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