'Iron' in the Bible

While it was being built, the house was built of stone prepared and finished (precut) at the quarry, and no hammer, axe, or iron tool of any kind was heard in the house while it was under construction.

(for they are Your people and Your heritage, whom You brought out of Egypt, from the midst of the iron furnace [of slavery and oppression]),

Then Zedekiah the son of Chenaanah made for himself horns of iron and said, “Thus says the Lord: ‘With these you will gore the Arameans (Syrians) until they are destroyed.’”