Joseph Benson's Commentary of the Old and New Testaments - Jeremiah 51:20-24
Jeremiah 51:20-24. Thou art my battle-axe, &c. Cyrus, or rather the army of the Medes and Persians, seems to be intended here; compare Jeremiah 51:11-12; as elsewhere the instrument of God’s vengeance is called a sword, a rod, a scourge. This army, with Cyrus, their general, God here says he will make use of for destroying the whole power of the Babylonish empire, and all orders and degrees of men in it, as he had formerly made that empire the executioner of his judgments upon... read more
Albert Barnes' Notes on the Whole Bible - Jeremiah 51:20
Or, Thou art my maul, weapons of war etc. The maul or mace Proverbs 25:18 only differs from the hammer Jeremiah 50:23 in being used for warlike purposes.Omit the “will” in “will I break.” The crushing of the nations was going on at the time when the prophet wrote. Most commentators consider that Babylon was the mace of God. read more