Numbers 35:24-27

24 the assembly must judge between him and the avenger of blood according to these regulations.

25 The assembly must protect the one accused of murder from the avenger of blood and send him back to the city of refuge to which he fled. He must stay there until the death of the high priest, who was anointed with the holy oil.

26 “‘But if the accused ever goes outside the limits of the city of refuge to which he has fled

27 and the avenger of blood finds him outside the city, the avenger of blood may kill the accused without being guilty of murder.