1 Kings 6:6-8

Amplified Bible

⁶ The lowest story was five cubits wide, the middle was six cubits wide, and the third was seven cubits wide; for he made offsets (niches) in the walls all around on the outside of the house so that the supporting beams would not be inserted into the walls of the house.

⁷ While it was being built, the house was built of stone prepared and finished (precut) at the quarry, and no hammer, axe, or iron tool of any kind was heard in the house while it was under construction.

⁸ The entrance to the lowest side chamber was on the right [or south] side of the house; and they would go up winding stairs to the middle [level], and from the middle to the third.