19 Then the magicians said to Pharaoh, “This is God’s finger:” and Pharaoh’s heart was hardened, and he didn’t listen to them; as Yahweh had spoken.
20 Yahweh said to Moses, “Rise up early in the morning, and stand before Pharaoh; behold, he comes out to the water; and tell him, ‘This is what Yahweh says, “Let my people go, that they may serve me.
21 Else, if you will not let my people go, behold, 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 whereon they are.
22 I will set apart in that day the land of Goshen, in which my people dwell, that no swarms of flies shall be there; to the end you may know that I am Yahweh on the earth.
23 I will put a division between my people and your people: by tomorrow shall this sign be.”’”
24 Yahweh did so; and there came grievous swarms of flies into the house of Pharaoh, and into his servants’ houses: and in all the land of Egypt the land was corrupted by reason of the swarms of flies.
25 Pharaoh called for Moses and for Aaron, and said, “Go, sacrifice to your God in the land!”