Daniel 2:41-42

41And as you saw the feet and toes, partly of potter’s clay and partly of iron, it will be a divided kingdom; but there will be in it some of the durability and strength of iron, just as you saw the iron mixed with common clay.

42As the [ten] toes of the feet were partly of iron and partly of clay, so some of the kingdom will be strong, and another part of it will be brittle.