Ezekiel 40:44-46

Outside the inner gate, within the inner court, there were chambers for the singers:  , one  beside the north gate, facing south, and another beside the south  gate, facing north. Then the man said to me, “This chamber that faces south is for the priests who keep charge of the temple.  The chamber that faces north is for the priests who keep charge of the altar. These are the sons of Zadok,  the ones from the sons of Levi who may approach the LORD to serve him.”