Ezekiel 41:5-7

‘Then he measured the wall of the house, six cubits. And the breadth of every side-chamber, four cubits, around the house on every side. And the side-chambers were in three storeys, one over another, and thirty in order. And they went into the wall which belonged to the house for the side-chambers round about, that they might have support in it, and not have support from the wall of the house.'

The wall enclosing the vestibule, holy place, and most holy place was six cubits thick. Rooms four cubits deep surrounded this wall on all sides except the east. There were three storeys of these chambers, thirty chambers on each level, again a complete provision (3x3x10). There was another wall on the outside of these chambers which bore their weight so that the inner wall of the temple did not have to carry it.