Ezekiel 40:12

The space also, literally, "the limit or boundary," apparently a low barrier wall, before the little chambers, where they flanked the entrance portico, was one cubit on this side, and the space was one cubit on that side, the barrier thus serving to keep those who entered in the center of the passage amid preventing their crowding into the niche-like cells of the guard-rooms; and the little chambers were six cubits on this side and six cubits on that side.