Exodus 8:18-22

18The soothsayer priests tried with their secret arts to produce 1gnats, but 2they could not; so there were 3gnats on every person and animal. 19Then the soothsayer priests said to Pharaoh, “4This is the finger of God.” But Pharaoh’s heart was 5hardened, and he did not listen to them, just as the Lord had said.

20Then the Lord said to Moses, “6Rise early in the morning and present yourself before Pharaoh, 7as 8he comes out to the water; and say to him, ‘This is what the Lord says: “9Let My people go, so that they may serve Me. 21For if you are not going to 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 will be full of swarms of flies, and also the ground on which they live. 2210But on that day I will set apart the land of Goshen, where My people are 11living, so that no swarms of flies will be there, in order that you may know that 1213I, the Lord, am in the midst of the land.