1 Kings 6:15-18

15He built the walls of the interior of the house [that is, the Holy Place and the Holy of Holies] with boards of cedar, from the floor of the house to the rafters of the ceiling. He overlaid the interior with wood, and he overlaid the floor of the house with boards of cypress.

16He built twenty cubits on the rear of the house with boards of cedar from the floor to the ceiling; he built its interior as the [inner] sanctuary, the Holy of Holies.

17The [rest of the] house, that is, the temple in front of the Holy of Holies, was forty cubits long.

18The cedar on the house within had wood carvings in the shape of gourds and open flowers. Everything was cedar; no stone was visible.