Matthew Henry on Jeremiah 49:34-39

The Elamites were the Persians; they acted against God's Israel, and must be reckoned with. Evil pursues sinners. God will make them know that he reigns. Yet the destruction of Elam shall not be for ever. But this promise was to have its full accomplishment in the days of the Messiah. In reading the Divine assurance of the destruction of all the enemies of the church, the believer sees that the issue of the holy war is not doubtful. It is blessed to recollect, that He who is for us, is more than all against us. And he will subdue the enemies of our souls.