Jamieson, Fausset and Brown on Isaiah 39:2

2. glad--It was not the mere act, but the spirit of it, which provoked God (2Ch 32:25), "Hezekiah rendered not again according to the benefit done unto him, for his heart was lifted up"; also compare 2Ch 32:31. God "tries" His people at different times by different ways, bringing out "all that is in their heart," to show them its varied corruptions. Compare David in a similar case (1Ch 21:1-8).

precious things--rather, "the house of his (aromatic) spices"; from a Hebrew root, to "break to pieces," as is done to aromatics.

silver ... gold--partly obtained from the Assyrian camp (Is 33:4); partly from presents (2Ch 32:23, 27-29).

precious ointment--used for anointing kings and priests.

armour--or else vessels in general; the parallel passage (2Ch 32:27), "treasuries ... for shields," favors English Version. His arsenal.