Ezekiel 41:6-7

6And 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 all around, that they might have hold, but they had not hold in the wall of the house.123

7And there was an enlarging, and a winding about still upward to the side chambers: for the winding about of the house went still upward on all sides of the house: therefore the breadth of the house was still upward, and so went up from the lowest chamber to the highest by the middle chamber .4