'Gnats' in the Bible

The Lord said to Moses, "Tell Aaron, 'Extend your staff and strike the dust of the ground, and it will become gnats throughout all the land of Egypt.'"

They did so; Aaron extended his hand with his staff, he struck the dust of the ground, and it became gnats on people and on animals. All the dust of the ground became gnats throughout all the land of Egypt.

When the magicians attempted to bring forth gnats by their secret arts, they could not. So there were gnats on people and on animals.