Numbers 35:26-28

New International Version

²⁶ “‘But if the accused ever goes outside the limits of the city of refuge to which they fled ²⁷ and the avenger of blood finds them outside the city, the avenger of blood may kill the accused without being guilty of murder. ²⁸ The accused must stay in the city of refuge until the death of the high priest; only after the death of the high priest may they return to their own property.