Ezekiel 41:9

and the breadth of the wall of each side without was five cubits; and the spaces that were left between the sides of the house,

The thickness of the wall, which was for the side chamber without, was five cubits: and that which was left was the place of the side chambers that were within.

The thickness of the outer wall of the side rooms was five cubits. That which was left was the place of the side rooms that belonged to the house.