Ezekiel 40:35-38

Then he brought me to the north gate, and he measured it. It had the same size as the others. Its side rooms, its jambs, and its vestibule were of the same size as the others, and it had windows all around. Its length was fifty cubits, and its breadth twenty-five cubits. Its vestibule faced the outer court, and it had palm trees on its jambs, on either side, and its stairway had eight steps. There was a chamber with its door in the vestibule of the gate, where the burnt offering was to be washed.