'Dust' in the Bible

And Jehovah saith unto Moses, 'Say unto Aaron, Stretch out thy rod, and smite the dust of the land, and it hath become gnats in all the land of Egypt.'

And they do so, and Aaron stretcheth out his hand with his rod, and smiteth the dust of the land, and the gnats are on man and on beast; all the dust of the land hath been gnats in all the land of Egypt.

and it hath become small dust over all the land of Egypt, and it hath become on man and on cattle a boil breaking forth with blains, in all the land of Egypt.'