Ezekiel 41:5; Ezekiel 41:6

5 Then he measured the wall of the temple, six cubits thick, and the breadth of the side chambers, four cubits, all around the temple.

6 And the side chambers were in three stories, one over another, thirty in each story. There were offsets all around the wall of the temple to serve as supports for the side chambers, so that they should not be supported by the wall of the temple.