'Side chamber' in the Bible

Then said he unto me This! is the holy of holies. Then measured he the wall of the house six cubits, - and the breadth of the side-chamber, four cubits round about on every side of the house round about.

The breadth of the wall which pertained to the side-chamber on the outside was five cubits,- and that which was left vacant between the side-chambers which pertained to the house.

And the entrance of the side-chamber, was at the vacant space, one entrance toward the north, and another entrance, toward the south, - and the breadth of the place left vacant was five cubits round about on every side.