'Dust' in the Bible

And Yahweh said to Moses, "Say to Aaron, 'Stretch out your staff and strike the dust of the land, and it will become gnats in all the land of Egypt.'"

And he did so, and Aaron stretched out his hand with his staff, and he struck the dust of the land, and it became gnats on the humans and on the animals; all of the dust of the land became gnats in all the land of Egypt.

And it will become fine dust over all the land of Egypt, and it will become on humans and on animals a skin sore sprouting blisters in all the land of Egypt."