Exodus 8:16-23

So the LORD said to Moses, “Say to Aaron, ‘Stretch out your rod, and strike the dust of the land, so that it may become lice throughout all the land of Egypt.’ ” And they did so. For Aaron stretched out his hand with his rod and struck the dust of the earth, and it became lice on man and beast. All the dust of the land became lice throughout all the land of Egypt. Now the magicians so worked with their enchantments to bring forth lice, but they could not. So there were lice on man and beast. Then the magicians said to Pharaoh, “This is the finger of God.” But Pharaoh’s heart grew hard, and he did not heed them, just as the LORD had said. And the LORD said to Moses, “Rise early in the morning and stand before Pharaoh as he comes out to the water. Then say to him, ‘Thus says the LORD: “Let My people go, that they may serve Me. Or else, if you will not let My people go, behold, I will send swarms of flies on you and your servants, on your people and into your houses. The houses of the Egyptians shall be full of swarms of flies, and also the ground on which they stand. And in that day I will set apart the land of Goshen, in which My people dwell, that no swarms of flies shall be there, in order that you may know that I am the LORD in the midst of the land. I will make a difference between My people and your people. Tomorrow this sign shall be.” ’ ”