Charles Ellicott Commentary 1 Kings 6:31

"And for the entrance of the oracle he made doors of olive-wood: the lintel [and] door-posts were a fifth part [of the wall]." — 1 Kings 6:31 (ASV)

Doors. The two doors of olive wood, from the Holy place into the Oracle, which usually stood open, showing the veil and the golden chains, were of moderate size. If our translation (as is probable) is correct, the outside measure of the lintel and post was a fifth part of the wall, that is, four cubits, or six feet. Each door, therefore, would be less than six feet by three.

The description of the gilding states with minute accuracy that in overlaying all these doors with gold, gold was “spread,” that is, made to cover the carvings in relief (cherubim, 1 Kings 6:35); in the other doors, the gold was fitted, probably beaten into shape, over the carved work.