19. Then the magicians said to Pharaoh, “This is the finger of God.” Nevertheless, Pharaoh’s heart was hardened, and he did not listen to them, just as the Lord had said.
20. So the Lord said to Moses, “Rise up early in the morning and stand before Pharaoh as he comes forth to the water and say to him, ‘Thus says the Lord: Let My people go, so that they may serve Me.
21. Otherwise, if you will not let My people go, indeed I will send swarms of flies on you, and on your servants, and on your people, and into your houses. And the houses of the Egyptians shall be full of swarms of flies and also the ground wherever they are.
22. “ ‘I will in that day set apart the land of Goshen, in which My people dwell, so that no swarms of flies shall be there, in order that you may know that I am the Lord in the midst of the earth.