Exodus 8:7, 18-19

But the magicians did the same by their secret arts and made frogs come up on the land of Egypt.

The magicians tried by their secret arts to produce gnats, but they could not. So there were gnats on man and beast. Then the magicians said to Pharaoh, “This is the finger of God.” But Pharaoh’s heart was hardened, and he would not listen to them, as the LORD had said.