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 an accused person return home.
NIV
Because the manslayer should have remained in his city of refuge until the death of the high priest. But after the high priest's death the manslayer shall return to the land of his possession.
AMP
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.
KJV