Ibn Ezra on Exodus 8:14/אבן עזרא על שמות ח׳:י״ד

1AND THE MAGICIANS DID SO. They struck the dust of the earth.

2TO BRING FORTH GNATS. To cause the earth to bring forth gnats as Aaron did. However, they could not do so.

3[AND THERE WERE GNATS UPON MAN, AND UPON BEAST.] Scripture notes this a second time because the plague was also upon the magicians.