'Dust of the Earth' in the Bible

I will make your descendants as the dust of the earth, so that if anyone can number the dust of the earth, then your descendants can also be numbered.

Your descendants will also be like the dust of the earth, and you will spread out to the west and to the east and to the north and to the south; and in you and in your descendants shall all the families of the earth be blessed.

Then the Lord said to Moses, “Say to Aaron, ‘Stretch out your staff and strike the dust of the earth, that it may become gnats through all the land of Egypt.’”

They did so; and Aaron stretched out his hand with his staff, and struck the dust of the earth, and there were gnats on man and beast. All the dust of the earth became gnats through all the land of Egypt.

“Then I pulverized them as the dust of the earth;I crushed and stamped them as the mire of the streets.

Now, O Lord God, Your promise to my father David is fulfilled, for You have made me king over a people as numerous as the dust of the earth.

Water wears away stones,Its torrents wash away the dust of the earth;So You destroy man’s hope.

Who has measured the waters in the hollow of His hand,And marked off the heavens by the span,And calculated the dust of the earth by the measure,And weighed the mountains in a balanceAnd the hills in a pair of scales?

“These who pant after the very dust of the earth on the head of the helplessAlso turn aside the way of the humble;And a man and his father resort to the same girlIn order to profane My holy name.