Numbers 35:24-27

24the assembly must judge between the accused and the avenger of blood according to these regulations. 25The assembly must protect the one accused of murder from the avenger of blood and send the accused back to the city of refuge to which they fled. The accused 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 they fled 27and the avenger of blood finds them outside the city, the avenger of blood may kill the accused without being guilty of murder.