He lined its interior walls with cedar boards, paneling them from the floor of the temple to the ceiling,1 and covered the floor of the temple with planks of pine.2
References for 1 Kings 6:15
He 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.3
References for 1 Kings 6:16
The main hall in front of this room was forty cubits long.
References for 1 Kings 6:17
The inside of the temple was cedar,4 carved with gourds and open flowers. Everything was cedar; no stone was to be seen.
References for 1 Kings 6:18
He prepared the inner sanctuary5 within the temple to set the ark of the covenant6 of the LORD there.
References for 1 Kings 6:19
The inner sanctuary7 was twenty cubits long, twenty wide and twenty high. He overlaid the inside with pure gold, and he also overlaid the altar of cedar.8
References for 1 Kings 6:20
Solomon covered the inside of the temple with pure gold, and he extended gold chains across the front of the inner sanctuary, which was overlaid with gold.
So he overlaid the whole interior with gold. He also overlaid with gold the altar that belonged to the inner sanctuary.