The magicians said unto Pharaoh, This is the finger of God. Or "of a God." It is not probable that the magicians believed in a single God, or intended in what they said to express any monotheistic idea. All that they meant to say was—"This is beyond the power of man—it is supernatural—some god must be helping the Israelites." No doubt they had come to this conclusion by a careful scrutiny of all the miracles hitherto wrought by Aaron. He hearkened not unto them. The magicians were minded to resist no longer; but Pharaoh was otherwise minded. It is quite possible that the mosquito plague did not greatly annoy him. He would probably possess lofty apartments above the height to which the mosquito ascends (Herod. 2.95); or he may have guarded himself by mosquito curtains of the finest Egyptian muslin. His subjects would naturally suffer from such a plague far more than he. As the Lord had said. See the comment on the same phrase in Exodus 8:11
HOMILETICS