Exodus 8:18-22

18Pharaoh’s magicians tried to do the same thing with their secret arts, but this time they failed. And the gnats covered everyone, people and animals alike.

19“This is the finger of God!” the magicians exclaimed to Pharaoh. But Pharaoh’s heart remained hard. He wouldn’t listen to them, just as the Lord had predicted.

20Then the Lord told Moses, “Get up early in the morning and stand in Pharaoh’s way as he goes down to the river. Say to him, ‘This is what the Lord says: Let my people go, so they can worship me.

21If you refuse, then I will send swarms of flies on you, your officials, your people, and all the houses. The Egyptian homes will be filled with flies, and the ground will be covered with them.

22But this time I will spare the region of Goshen, where my people live. No flies will be found there. Then you will know that I am the Lord and that I am present even in the heart of your land.