Ezekiel 41:7-11

And there was an enlarging, and a winding about still upward to the side chambers: for the winding about of the house went still upward round about the house: therefore the breadth of the house was still upward, and so increased from the lowest chamber to the highest by the midst.

I saw also the height of the house round about: the foundations of the side chambers were a full reed of six great cubits.

The thickness of the wall, which was for the side chamber without, was five cubits: and that which was left was the place of the side chambers that were within.

And between the chambers was the wideness of twenty cubits round about the house on every side.

And 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 round about.