1 Kings (Author Compiled by Isaiah and Jeremiah from records of Nathan, Gad, Iddo, Ahijah, Jehu and others.)
6:16And he built twenty cubits of the innermost part of the house, both floor and walls, with boards of cedar; and he built them for it within, to be the oracle, the most holy place.
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.