'Dust of the Earth' in the Bible

And I will make thy seed as the dust of the earth. So that if a man can number the dust of the earth, then may thy seed also be numbered.

And thy seed shall be as the dust of the earth, and thou shall spread abroad to the west, and to the east, and to the north, and to the south. And in thee and in thy seed shall all the families of the earth be blessed.