Ezekiel 41:5; Ezekiel 41:6

5 Then he measured the wall of the temple; it was six cubits thick, and each side room around the temple was four cubits wide.

6 The side rooms were on three levels, one above another, thirty on each level. There were ledges all around the wall of the temple to serve as supports for the side rooms, so that the supports were not inserted into the wall of the temple.