Daniel 2:40
And the fourth kingdom shall be strong as iron: forasmuch as iron breaketh in pieces and subdueth all things: and as iron that breaketh all these, shall it break in pieces and bruise.
Cross-reference
Daniel 2:33
Parallel
Daniel 2:33 describes the iron legs of the statue, which Daniel 2:40 interprets as the fourth kingdom's strength.
Daniel 7:7
Parallel
In Daniel 7:7, the fourth beast with iron teeth is the same kingdom — a symbolic parallel to Daniel 2's iron crushing.
Daniel 7:19
Parallel
Daniel 7:7 depicts a fourth beast with iron teeth, matching the iron kingdom in Daniel 2:40.
Daniel 7:23
Parallel
In Daniel 7:23, the fourth kingdom devours and breaks in pieces — direct interpretation of the same vision.