Ezekiel 44:11, 15

Yet they shall be ministers in my sanctuary, having oversight at the gates of the house, and ministering in the house: they shall slay the burnt-offering and the sacrifice for the people, and they shall stand before them to minister unto them.

But the priests the Levites, the sons of Zadok, that kept the charge of my sanctuary when the children of Israel went astray from me, they shall come near to me to minister unto me; and they shall stand before me to offer unto me the fat and the blood, saith the Lord Jehovah