Ezekiel 40:44-46

Outside the inner gate were the chambers for the singers in the inner court, one facing south at the side of the northern gateway, and the other facing north at the side of the southern gateway. Then he said to me, “This chamber which faces south is for the priests who have charge of the temple. The chamber which faces north is for the priests who have charge of the altar; these are the sons of Zadok, from the sons of Levi, who come near the LORD to minister to Him.”