1 Kings 6:16-20

16He partitioned off twenty cubits at the rear of the temple with cedar boards from floor to ceiling to form within the temple an inner sanctuary, the Most Holy Place. 17The main hall in front of this room was forty cubits long. 18The inside of the temple was cedar, carved with gourds and open flowers. Everything was cedar; no stone was to be seen. 19He prepared the inner sanctuary within the temple to set the ark of the covenant of the Lord there. 20The inner sanctuary was twenty cubits long, twenty wide and twenty high. He overlaid the inside with pure gold, and he also overlaid the altar of cedar.