Exodus 8:18-19

And the scribes do so with their flashings, to bring out the gnats, and they have not been able, and the gnats are on man and on beast; and the scribes say unto Pharaoh, ‘It [is] the finger of God;’ and the heart of Pharaoh is strong, and he hath not hearkened unto them, as JEHOVAH hath spoken.