19. And the sorcerers said to Pharaoh: "This is the finger of God." And the heart of Pharaoh was hardened, and he did not listen to them, just as the Lord had instructed.
20. The Lord also said to Moses: "Arise at first light, and stand in the sight of Pharaoh, for he will go out to the waters. And you will say to him: 'Thus says the Lord: Release my people to sacrifice to me.
21. But if you will not release them, behold, I will send upon you, and upon your servants, and upon your people, and into your houses, diverse kinds of flies. And the houses of the Egyptians will be filled with diverse kinds of flies, as well as the whole land in which they will be.
22. And in that day, I will cause a miracle in the land of Goshen, where my people are, so that flies will not be there. And you will know that I am the Lord in the midst of the earth.
23. And I will set a division between my people and your people. Tomorrow this sign will be.' "