1 Kings 6:16
And he built twenty cubits on the sides of the house, both the floor and the walls with boards of cedar: he even built them for it within, even for the oracle, even for the most holy place. And he built twenty cubits on the sides of the house, both the floor and the walls with boards of cedar: he even built them for it within, even for the oracle, even for the most holy place.
The verse belongs to the account of Solomon's construction of the temple. It describes the inner room, the most holy place, built with cedar boards. That temple was a permanent building that replaced the movable tabernacle while retaining its proportions and furnishings. It was unsurpassed in richness, beauty, and costly design.