'Iron' in the Bible

I, the Lord, hereby promise to make you as strong as a fortified city, an iron pillar, and a bronze wall. You will be able to stand up against all who live in the land, including the kings of Judah, its officials, its priests and all the people of the land.

I reported, "All of them are the most stubborn of rebels! They are as hard as bronze or iron. They go about telling lies. They all deal corruptly.

Can you people who are like iron and bronze break that iron fist from the north?

The sin of Judah is engraved with an iron chisel on their stone-hard hearts. It is inscribed with a diamond point on the horns of their altars.

"Go and tell Hananiah that the Lord says, 'You have indeed broken the wooden yoke. But you have only succeeded in replacing it with an iron one!

"The Lord has made you priest in place of Jehoiada. He has put you in charge in the Lord's temple of controlling any lunatic who pretends to be a prophet. And it is your duty to put any such person in the stocks with an iron collar around his neck.