'Iron' in the Bible

and he shall make clearings in the thickets of the forest with iron; and Lebanon shall fall by a mighty one.

I will go before thee, and make the elevated places plain; I will break in pieces the brazen doors, and cut asunder the bars of iron;

Because I knew that thou art obstinate, and thy neck is an iron sinew, and thy brow brass,

For bronze I will bring gold, and for iron I will bring silver, and for wood bronze, and for stones iron; and I will make thine officers peace, and thy rulers righteousness.