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.

Read Numbers 35:28 Using Other Translations

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.
For he must remain in his city of refuge until the death of the high priest, but after the death of the high priest the manslayer may return to the land of his possession.
The slayer should have stayed inside the city of refuge until the death of the high priest. But after the death of the high priest, the slayer may return to his own property.