Make bright the arrows; gather the shields: the LORD hath raised up the spirit of the kings of the Medes: for his device is against Babylon, to destroy it; because it is the vengeance of the LORD, the vengeance of his temple.
These words might have been addressed to the Medes as well as to the Babylonians. If the latter meaning be approved, that is, that the Prophet addresses the Babylonians, the words are a taunt, as though he had said, that they were to no purpose spending their labors in preparing their armies, because God would be stronger than they, and that the Medes would carry...
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
Make bright the arrows,.... Which were covered with rust; scour them of it; anoint them with oil, as armour were wont to be; make them neat, clean, and bright, that they may pierce the deeper; hence we read of a "polished shaft", or arrow, one made bright and pure, Isa 49:2; agreeably to this some render the word "sharpen the arrows" (k); so the Targum.