Ezekiel 41:3-7

Then he went inside and measured each side pillar of the doorway, two cubits, and the doorway, six cubits high; and the width of the doorway, seven cubits.

And he measured its length, twenty cubits, and the width, twenty cubits, before the sanctuary; and he said to me, “This is the Most Holy Place.”

Then he measured the wall of the temple, six cubits; and the width of the side chambers, four cubits, all around the house on every side.

The side chambers were in three stories, one above another, and thirty in each story; and the side chambers extended to the wall which stood on their inward side all around, so that they could be attached, but not be attached to the wall of the temple itself.

And the side chambers surrounding the temple were wider at each successive story. Because the structure surrounding the temple went upward by stages on all sides of the temple, for that reason the width of the temple increased as it went higher; and so one went up from the lowest story to the highest by way of the second story.