'Iron' in the Bible

and having passed through a first ward, and a second, they came unto the iron gate that is leading to the city, which of its own accord did open to them, and having gone forth, they went on through one street, and immediately the messenger departed from him.

and he shall rule them with a rod of iron -- as the vessels of the potter they shall be broken -- as I also have received from my Father;

and they had breastplates as breastplates of iron, and the noise of their wings is as the noise of chariots of many horses running to battle;

and she brought forth a male child, who is about to rule all the nations with a rod of iron, and caught away was her child unto God and His throne,

lading of gold, and silver, and precious stone, and pearl, and fine linen, and purple, and silk, and scarlet, and all thyine wood, and every vessel of ivory, and every vessel of most precious wood, and brass, and iron, and marble,

and out of his mouth doth proceed a sharp sword, that with it he may smite the nations, and he shall rule them with a rod of iron, and he doth tread the press of the wine of the wrath and the anger of God the Almighty,