Matthew Poole and continuators on Ezekiel 21:11

11 And he hath given it to be furbished, that it may be handled the sword is sharpened, and it is furbished, to give it into the hand of the slayer.

Slights and despiseth all the resistance that can be made against it, and reckons all former chastisements were, but as the Rod, wherewith a Son is corrected, but now the Sword of an Enemy is drawn out, and will cut off all: Or, Nebuchadnezzar despiseth your King the Royal Family, and Nobles which are compared to Gods. chap. 19, 10, 11. and would use them as he would every common tree of the Wood, as it appears he did, when he put out Zedekiah's Eyes, and bound him in chains as a Slave.

Either God, whose Sword it is, or Nebuchadnezzar, God's Servant herein. Some refer it to Christ who is Lord, and Soveraign of his Church, and Governour of the World.

Be the fitter for use in the hand of the Slayer, i. e. the Chaldaean.