Verse 13. "Arise and thresh, O daughter of Zion" - This refers to the subject of the preceding verse. When God shall have gathered together all thy enemies, as into the threshing- floor, he will give thee commission and power to get a complete victory over them, and reduce them to servitude.
And that thou mayest be able to do this, he will be on thy side as a powerful helper; here signified by the metaphors, iron horns, and brazen hoofs. Thou shalt have power, authority, and unconquerable strength; for thine enemies shall be no more against thee than the corn against oxen shod with brass, or a puny animal against the horn of a fierce bull tipped with iron.
"I will consecrate their gain unto the Lord" - What they have taken from thee in the way of spoil shall be restored; and again consecrated unto the service of him who will show himself to be the Lord, the Supreme Governor of the whole earth. Was not this prediction fulfilled when Cyrus gave the Jews permission to return to their own land, and gave them back the sacred vessels of the temple which Nebuchadnezzar had carried away? The Maccabees and their successors recovered much of the booty of which the neighbouring nations had deprived the Jews; and the treasure taken was devoted to Jehovah. The first verse of the next chapter should conclude this.