Melachim Alef 6:5-7

Orthodox Jewish Bible

⁵ And against the wall of the Beis [Hamikdash] he built chambers round about, against the walls of the Beis [Hamikdash] round about, both of the Heikhal and of the Debir; and he made chambers round about;

⁶ The lowest story was five cubits broad, and the middle was six cubits broad, and the third was seven cubits broad; for without in the wall of the Beis [Hamikdash] he made narrow ledges round about, that the beams should not be fastened in the walls of the Beis [Hamikdash].

⁷ And the Beis [Hamikdash], when it was under construction, was built of stone made ready before it was brought there; so was neither hammer nor chisel nor any tool of iron heard in the Beis [Hamikdash], while it was under construction.