Charles Ellicott Commentary 1 Kings 6:20-22

"And within the oracle was [a space of] twenty cubits in length, and twenty cubits in breadth, and twenty cubits in the height thereof; and he overlaid it with pure gold: and he covered the altar with cedar. So Solomon overlaid the house within with pure gold: and he drew chains of gold across before the oracle; and he overlaid it with gold. And the whole house he overlaid with gold, until all the house was finished: also the whole altar that belonged to the oracle he overlaid with gold." — 1 Kings 6:20-22 (ASV)

These verses describe the overlaying with pure gold of the panelling of the house and of the Oracle, the partition dividing them, and the altar of incense. Even the floor was similarly covered. (See 1 Kings 6:30.)