inside of a chamber
Refers to the interior of a room or chamber, typically in a traditional or historical context. Rare in modern everyday speech.
In the old document, it was written, 'Wait inside the chamber.'
Compound of 房 (ぼう, 'chamber') + の (possessive particle) + 内 (うち, 'inside'). The exact historical derivation is uncertain; the term appears in classical or literary contexts.