'Rod of Iron' in the Bible

and he shall rule them with a rod of iron, as the vessels of earthenware are broken in pieces, as I also have received from My Father;

And she brought forth a man-child, who is about to rule all the nations with a rod of iron; and her child was caught up to God and to His throne.

And out of His mouth proceeds a sharp sword, that with it He may smite the nations, and He will govern them with a rod of iron; and He treadeth the wine-press of the fierceness of the wrath of God, the Almighty.