And the fourth kingdom shall be as strong as iron, inasmuch as iron breaks in pieces and shatters everything; and like iron that crushes, that kingdom will break in pieces and crush all the others.
Daniel 2:40
Surrounding context
2:39 But after you shall arise another kingdom inferior to yours; then another, a third kingdom of bronze, which shall rule over all the earth.
2:40 And the fourth kingdom shall be as strong as iron, inasmuch as iron breaks in pieces and shatters everything; and like iron that crushes, that kingdom will break in pieces and crush all the others.
2:41 Whereas you saw the feet and toes, partly of potter's clay and partly of iron, the kingdom shall be divided; yet the strength of the iron shall be in it, just as you saw the iron mixed with ceramic clay.