Ezekiel 41:8-11

8I saw also the height of the house all around: the foundations of the side chambers were a full reed of six great cubits. 9The thickness of the wall, which was for the side chamber on the outside, was five cubits: and that which was left was the place of the side chambers that were within. 10And between the chambers was the width of twenty cubits all around the house on every side. 11And the doors of the side chambers were toward the place that was left, one door toward the north, and another door toward the south: and the breadth of the place that was left was five cubits all around.