'Dust' in the Bible

Yahweh said to Moses, "Tell Aaron, 'Stretch out your rod, and strike the dust of the earth, that it may become lice throughout all the land of Egypt.'"

They did so; and Aaron stretched out his hand with his rod, and struck the dust of the earth, and there were lice on man, and on animal; all the dust of the earth became lice throughout all the land of Egypt.

It shall become small dust over all the land of Egypt, and shall be a boil breaking forth with boils on man and on animal, throughout all the land of Egypt."