Ezekiel 40:44-46

There were two rooms in the inner courtyard. One was beside the north gateway and faced south. The other room was beside the south gateway and faced north. The man said to me, “The room which faces south is for the priests who serve in the Temple area, while the room that faces north is for the priests who serve at the altar. This second group of priests are descendants of Zadok, the only descendants of Levi who can come near the LORD to serve him.”