Ezekiel 40:46

The position of the “chamber” looking to the north commanded a view of the brasen altar and the sacrifices, which were prepared at the north side of the altar. The sons of Zadok -The priests were all descended from one or other of the two sons of Aaron, Eleazar and Ithamar. David distributed the priestly offices between the families of Zadok, the representative of Eleazar, and Ahimelech, the representative of Ithamar1 Chronicles 24:3. From the time of Solomon not only the high priesthood, but the priesthood itself, so far as concerned its service, that of offering upon the two altars, seems to have been confined to the descendants of Zadok (see1 Chronicles 6:49-53).