Ezekiel 40:44-46

Outside the inner gate, within the inner court, were two rooms, one at the side of the north gate and facing south, and another at the side of the south gate and facing north. He said to me, “The room facing south is for the priests who guard the temple, and the room facing north is for the priests who guard the altar. These are the sons of Zadok, who are the only Levites who may draw near to the LORD to minister before him.”