Exodus 8:19-21

New International Version - UK

¹⁹ 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.

The plague of flies

²⁰ Then the Lord said to Moses, ‘Get up early in the morning and confront Pharaoh as he goes to the river and say to him, “This is what the Lord says: let my people go, so that they may worship me. ²¹ If you do not let my people go, I will send swarms of flies on you and your officials, on your people and into your houses. The houses of the Egyptians will be full of flies; even the ground will be covered with them.