Yet, because you saw the iron mingled with pottery from the earth, they will indeed be combined together with the offspring of man, but they will not adhere to one another, just as iron cannot be mixed with earthenware
Other versions
King James Version
And whereas thou sawest iron mixed with miry clay, they shall mingle themselves with the seed of men: but they shall not cleave one to another, even as iron is not mixed with clay. English Standard Version
As you saw the iron mixed with soft clay, so they will mix with one another in marriage, but they will not hold together, just as iron does not mix with clay.New International Version
And just as you saw the iron mixed with baked clay, so the people will be a mixture and will not remain united, any more than iron mixes with clay.