Ezekiel 41:6 (KJV)

So he measured the length thereof, twenty cubits; and the breadth, twenty cubits, before the temple: and he said unto me, This is the most holy place.

After he measured the wall of the house, six cubits; and the breadth of every side chamber, four cubits, round about the house on every side.

And the side chambers were three, one over another, and thirty in order; and they entered into the wall which was of the house for the side chambers round about, that they might have hold, but they had not hold in the wall of the house.

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.