Numbers 19:7

19:7 Then the priest must wash his clothes and bathe himself in water, and afterward he may come into the camp, but the priest will be ceremonially unclean until evening.

Numbers 35:28

35:28 because the slayer should have stayed in his town of refuge until the death of the high priest. But after the death of the high priest, the slayer may return to the land of his possessions.