Ezekiel 40:46

40:46 and the chamber which faces north is for the priests who keep charge of the altar. These are the descendants of Zadok, from the descendants of Levi, who may approach the Lord to minister to him.”

Ezekiel 43:22

43:22 “On the second day, you will offer a male goat without blemish for a sin offering. They will purify the altar just as they purified it with the bull.