'Rod of Iron' in the Bible

and he shall rule them with a rod of iron, as the vessels of a potter are broken to shivers,as I also have received of my Father.

And she brought forth a manchild, who is 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 goeth a sharp sword, that with it he may smite the nations; and he will rule them with a rod of iron; and he treadeth the winepress of the fierceness of the wrath of God Almighty.