Exodus 8:16-23

Then the LORD said to Moses, “Say to Aaron, ‘Stretch out your staff and strike the dust of the ground, and it will become [biting] gnats (lice) throughout the land of Egypt.’ ” They did so; Aaron stretched out his hand with his staff and struck the dust of the earth, and there were [biting] gnats on man and animal. All the dust of the land became gnats through all the land of Egypt. The magicians (soothsayer-priests) tried by their secret arts and enchantments to create gnats, but they could not; and there were gnats on man and animal. Then the magicians said to Pharaoh, “This is the [supernatural] finger of God.” But Pharaoh’s heart was hardened and he would not listen to them, just as the LORD had said. Now the LORD said to Moses, “Get up early in the morning and stand before Pharaoh as he is coming out to the water [of the Nile], and say to him, ‘Thus says the LORD, “Let My people go, so that they may serve Me. For if you do not let My people go, hear this: I will send swarms of [bloodsucking] insects 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 insects, as well as the ground on which they stand. But on that day I will separate and set apart the land of Goshen, where My people are living, so that no swarms of insects will be there, so that you may know [without any doubt] and acknowledge that I, the LORD, am in the midst of the earth. I will put a division (distinction) between My people and your people. By tomorrow this sign shall be in evidence.” ’ ”