Ezekiel 40:21

And the little chambers thereof, the guard-rooms, were three on this side and three on that side; and the posts, or pillars, thereof, and the arches thereof, the galleries, or porticoes, were after the measure of the first gate; the length thereof was fifty cubits, measuring from the outer entrance, and the breadth five and twenty cubits, from outer wall to outer wall of the niches.