Ezekiel 40:46-50

but the chamber which faces north is for the priests who are responsible for the altar. They are the sons of Zadok, who from the sons of Levi come near to the Lord to serve Him.”

He measured the courtyard, a perfect square, a hundred cubits long and a hundred cubits wide; and the altar was in front of the temple.

Then he brought me to the porch of the temple and measured each side pillar of the porch, five cubits on each side; and the width of the gate was three cubits on each side.

The length of the porch was twenty cubits, and the width eleven cubits; and at the stairway by which it was ascended were columns belonging to the side pillars, one on each side.