Whether by works in this place he meant their riches, got by the labour of their hands, or their idols, which often are called, by way of defamation, the works of their own hands, or their fortifications, is not much considerable; a confidence in creatures, opposed to a confidence in God, is doubtless the sin here intended, whatever the ground of it was, whether their idols, or riches, or fortified places. Chemosh was their principal idol, as appears by Numbers 21:29 Judges 11:24 1 Kings 11:7,33 2 Kings 23:13. God showeth them the vanity of this idolatry, by telling them that this idol should go into captivity, and be so far from being able to protect them, that he should not be able to protect himself or his own priests, or the princes that favoured him.
Related Commentaries of Jeremiah 48:7
Jeremiah 48:7
7 For because thou hast trusted in thy works and in thy treasures, thou shalt also be taken: and Chemosh shall go forth into captivity with his priests and his princes together.