1 Kings 6:5-6

5He then built a chambered structure along the temple wall, encircling the walls of the temple, that is, the sanctuary and the inner sanctuary. And he made side chambers all around.

6The lowest chamber was 7½ feet wide, the middle was 9 feet wide, and the third was 10½ feet wide. He also provided offset ledges for the temple all around the outside so that nothing would be inserted into the temple walls.