1 Kings 6:20
And the oracle in the forepart was twenty cubits in length, and twenty cubits in breadth, and twenty cubits in the height thereof: and he overlaid it with pure gold; and so covered the altar which was of cedar.
Cross-reference
In 1 Kings 6:22, the whole house is overlaid with gold, including the inner sanctuary's gold overlay mentioned here.
1 Kings 6:16 describes building the same inner sanctuary and overlaying it with gold—essentially a parallel account of this room.
In 1 Kings 6:2, the temple's overall dimensions (60x20x30) provide context for the inner sanctuary's 20-cubit cube here.
In 1 Kings 6:3, the porch dimensions (20x10) are given, another part of the same temple plan.
In Exodus 30:1-3, instructions for the gold-overlaid altar of incense in the tabernacle are mirrored by the cedar altar here.
In Exodus 25:10-22, the gold-overlaid ark and mercy seat are described, placed in the inner sanctuary described here.
2 Chronicles 3:8 gives the same dimensions and gold overlay for the Most Holy Place, adding the weight of 600 talents of gold.
Ezekiel 41:4 measures the inner sanctuary of a visionary temple with the same 20x20 cubit dimensions, echoing the Most Holy Place here.
2 Chronicles 3:7 records gold overlay on beams, walls, and doors of the temple—expanding on the gold covering of the inner sanctuary here.