Ezekiel 40:35-38

Then he brought me to the north gate and he measured it; the measurements were the same as those of the other gates, with its guardrooms, its side pillars, its porches; and the gate had windows all around. The length was fifty cubits and the width was twenty-five cubits. Its side pillars faced the outer courtyard, and palm tree decorations were [carved] on them on either side. And its stairway had eight steps. A chamber with its doorway was by the side pillars of the gates; there the burnt offering was to be washed.