Ezekiel 40:44-46

44On the outside of the inner gateway there were two chambers in the inner court, one at the side of the north gate facing south, the other at the side of the south gate facing north.

45And he said to me, "This chamber that faces south is for the priests who have charge of the temple,

46and the chamber that faces north is for the priests who have charge of the altar. These are the sons of Zadok, who alone among the sons of Levi may come near to the Lord to minister to him."