Daniel 2:33
its legs were iron, and its feet were partly iron and partly fired clay.
Daniel 2:40-43
A fourth kingdom will be as strong as iron; for iron crushes and shatters everything, and like iron that smashes, it will crush and smash all the others.
Daniel 7:7-8
“While I was watching in the night visions, a fourth beast
Daniel 7:19-26
“Then I wanted to know the true meaning of the fourth beast,