John Gill Bible Commentary

Then said he, what have they seen in thine house?.... Coming nearer to the point he had in view, and which was the thing that was displeasing to the Lord; not that he had received the ambassadors, and used them in such a manner as persons in such a quality ought to be used; but that he had shown them what he ought not to have done, and especially from such a principle of pride and vanity as he did: and Hezekiah answered without any reserve, very openly, not suspecting that the prophet was come with a reproof to him, or to blame him, or would blame him for what he had done: all that is in my house have they seen; the several royal apartments, and the furniture of them: there is nothing among my treasures that I have not showed them: which were more secret, laid up in cabinets, under lock and key; his gold, silver, jewels, and precious stones, spices, and ointments. Jerom thinks he showed them the furniture and vessels of the temple, though he does not mention them.