'Rod of Iron' in the Bible

and he shall rule them with a rod of iron, and crush them like earthen vessels, as I also have received of my Father,

And she bore a male child, who is about to rule all 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 shall rule them with a rod of iron, and he shall tread the wine-press of the indignant wrath of God Almighty.