Because the spoiler is come upon her, even upon Babylon, and her mighty men are taken, every one of their bows is broken: for the LORD God of recompences shall surely requite.
He confirms the former verse; for as the thing of which he speaks was difficult to be believed, he sets God before them, and shows that he would be the author of that war. He now continues his discourse and says, that desolators shall come against Babylon. He had ascribed to God what he now transfers to the Medes and the Persians.
Babylon was once a golden cup in the Lord's hand, filled with His favor, but also His battle-axe to break nations. Those that carry all before them a great while will yet meet their match; even Babylon's day will come, and it too shall fall.
AI summary
Commenting on Jeremiah 51:1-58
Thus saith the Lord of hosts,.... Because what follows might seem incredible ever to be effected; it is introduced with this preface, expressed by him who is the God of truth, and the Lord God omnipotent: the broad walls of Babylon shall be utterly broken; or rased up; the foundations of them, and the ground on which they stood made naked and bare, and open...