Exodus 8:7, 18, 19

But the magicians did the same things by their secret arts; they also made frogs come up on the land of Egypt.

But when the magicians tried to produce gnats by their secret arts, they could not. Since the gnats were on people and animals everywhere

the magicians said to Pharaoh, “This is the finger of God.” But Pharaoh’s heart was hard and he would not listen, just as the LORD had said.