Ezekiel 44:10-11, 14

But the Levites who went far from me, going astray from me after their idols when Israel went astray, shall bear their punishment. They shall be ministers in my sanctuary, having oversight at the gates of the temple and ministering in the temple. They shall slaughter the burnt offering and the sacrifice for the people, and they shall stand before the people, to minister to them.

Yet I will appoint them to keep charge of the temple, to do all its service and all that is to be done in it.