19. The magicians said to Pharaoh, "God's powerful finger has done this." But Pharaoh's heart was stubborn. He wouldn't listen, just as the Lord had said.
20. Then the Lord spoke to Moses. He said, "Get up early in the morning. Talk to Pharaoh as he goes down to the river. Say to him, 'The Lord says, "Let my people go. Then they will be able to worship me.
21. If you do not let my people go, I will send large numbers of flies. I will send them on you and your officials. I will send them on your people and into your homes. The houses of the Egyptians will be full of flies. Even the area where they live will be full of flies.
22. " ' "But on that day I will treat the area of Goshen differently from yours. That is where my people live. There will not be large numbers of flies in Goshen. Then you will know that I, the Lord, am in this land.
23. I will treat my people differently from yours. The miraculous sign will take place tomorrow." ' "