Jeremiah 51:56

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. He had said, Jehovah hath desolated or wasted, שדד יהוה, shedad Jeve; he says now, coming is a desolator, שודד, shudad. Who is he? not God, but Cyrus, together with the united army of the Persians and the Medes; yea, with vast forces assembled from many nations, Now that the same name is given to God and to the Persians, this is done with regard to the ministration. Properly speaking, God was the desolator of Babylon; but as in this expedition he employed the services of men, and made the Persians and the Medes, as it were, his ministers, and the executioners of his judgment, the name which properly belongs to God is transferred to the ministers whom he employed. The same mode of speaking is also used when blessings are spoken of. He is said to have raised up saviors for his people, while yet he himself is the only Savior, nor can any mortal assume that name without sacrilege. (Judges 3:15; 2 Kings 13:5.) For God’s peculiar glory is taken away, when salvation is sought through the arm of men, as we have seen in Jeremiah 17. But though God is the only author of salvation, yet it is no objection to this truth, that he employs men in effecting his purposes. So also he converts men, illuminates their minds by the ministers of the gospel, and also delivers them from eternal death. (Luke 1:17.) Doubtless were any one to arrogate to himself what Christ is pleased to concede to the ministers of his gospel, he could by no means be endured; but as I have already said, we must bear this in mind, that though God acts by his own power and never borrows anything from any one, nor stands in need of any help, yet what properly belongs to him is, in a manner, applied to men, at least by way of concession. So now, then, the Prophet calls God the desolator, and afterwards he honors with the same title the Persians and the Medes.

He adds, that the valiant men of Babylon were taken, according to what we have before seen, that the city was so taken that no one resisted. Then he adds, that their bow was broken, there is a part stated for the whole; for under the word bow he includes all kinds of armor. But as bows were used at a distance, and as enemies were driven from the walls by casting arrows, the Prophet says that there would be no use made of bows, because the enemies would skew themselves in the middle of the city before the watchmen saw them, as we know that such was really the case. We now perceive why the Prophet mentions the bow rather than swords or other weapons.