The anger of the LORD will not turn back until he has executed and accomplished the intents of his heart. In the latter days you will understand it clearly.
He confirms what he had said, lest the hypocrites, with whom he had to do, should think that their punishment would be light and soon pass away. For though they may have seen that God’s hand was armed against them, yet they took comfort, because they expected that it would only be for a short time.
Here is a long lesson for the false prophets. As none were more bitter and spiteful against God's true prophets than they, so there were none on whom the true prophets were more severe, and justly. The prophet had complained to God of those false prophets (Jer 14:13), and had often foretold that they should be involved in the common ruin; but here they have woes of their own. I.
Commenting on Jeremiah 23:9-32
The anger of the Lord shall not return,.... Having a commission from him, and being sent forth on an errand to do business for him, it shall not return to him, without having done it; as a servant sent by his master does not return till he has finished what he was sent about: until he have executed, and till he have performed the thoughts...