Adam Clarke on Jeremiah 16:19

The Gentiles shall come - Even the days shall come when the Gentiles themselves, ashamed of their confidence, shall renounce their idols, and acknowledge that their fathers had believed lies, and worshipped vanities. This may be a prediction of the calling of the Gentiles by the Gospel of Christ; if so, it is a light amidst much darkness. In such dismal accounts there is need of some gracious promise relative to an amended state of the world.