And he built twenty cubits on the sides of the house
At the end or extremity of it, as the Targum; that is, he built the most holy place, which was twenty two cubits long, at the end of the holy place, which he wainscotted as the other:
both the floor and the walls with boards of cedar;
or from the floor, including that, to the walls on each side, from wall to wall, and taking in them, they were all lined with cedar wood:
he even built [them] for it within, [even] for the oracle, [even] for
the most holy [place];
which explains what building is spoken of, and that the inside of that was covered with cedar from bottom to top.
The Brenton translation of the Septuagint is in the public domain.