'Iron' in the Bible

When they were past the first and the second guard, they came to the iron gate that leads into the city, which opened to them by itself. They went out, and went down one street, and immediately the angel departed from him.

through the hypocrisy of men who speak lies, branded in their own conscience as with a hot iron;

He will rule them with a rod of iron, shattering them like clay pots; as I also have received of my Father:

They had breastplates, like breastplates of iron. The sound of their wings was like the sound of chariots, or of many horses rushing to war.

She gave birth to a son, a male child, who is to rule all the nations with a rod of iron. Her child was caught up to God, and to his throne.

merchandise of gold, silver, precious stones, pearls, fine linen, purple, silk, scarlet, all expensive wood, every vessel of ivory, every vessel made of most precious wood, and of brass, and iron, and marble;

Out of his mouth proceeds a sharp, double-edged sword, that with it he should strike the nations. He will rule them with an iron rod. He treads the winepress of the fierceness of the wrath of God, the Almighty.