1 Kings 6:7-8

7And the house, when it was being built, was built of stone entirely made ready before it was brought thither; so that there was neither hammer nor axe nor any tool of iron heard in the house while it was being built.

8The entrance to the side-chambers of the middle [floor] was in the right side of the house; and they went up by winding stairs into the middle [floor], and out of the middle into the third.