The prophet ends his elegy with the language of Messianic hope. The earthly king had fallen Lamentations 4:20; but Israel cannot really perish. First then Edom, the representative of the Church’s foes, is ironically told to rejoice. Rejoice she did at the capture of Jerusalem Jeremiah 49:7-22; but her punishment is quickly to follow.
The punishment of thine iniquity is accomplished - literally, Thy iniquity is ended. This is the result of Judah having borne her punishment. And as it is not just to punish twice for the same thing, therefore Jeremiah adds, “He will not send thee again into captivity;” not meaning that under all circumstances Judah would have immunity from exile; - for that would depend upon her future conduct: but that her present guilt being expiated, she would have nothing to fear on its account.
He will discover thy sins - See the margin. As Edom rejoices when the Church is chastised, so is the day of the Church’s triumph that also on which the wicked meet with retribution.