Ezekiel 41:5-7

New Catholic Bible

⁵ Then he measured the wall of the temple, which was six cubits thick. The width of the side chambers was four cubits all around the temple. ⁶ The side chambers were on three levels, one above the other, with thirty chambers on each level. There were ledges all around the wall of the temple that were designed to serve as supports for the side chambers, but there were no supports in the wall of the temple itself.

⁷ The passageway leading upward to the side chambers became broader from story to story, for the structure surrounding the temple was constructed in successive stages, so that the width of the cells increased from one story to the next. One ascended from the lowest story to the highest story by means of the middle one.