Numbers 35:27-29

King James Version

²⁷ And the revenger of blood find him without the borders of the city of his refuge, and the revenger of blood kill the slayer; he shall not be guilty of blood:

²⁸ Because he should have remained in the city of his refuge until the death of the high priest: but after the death of the high priest the slayer shall return into the land of his possession.

²⁹ So these things shall be for a statute of judgment unto you throughout your generations in all your dwellings.