Exodus 8:17. Or else, if you will not send My people away, behold, I shall send swarms of Flies upon you, upon your servants, upon your people, and into your houses. And the houses of the Egyptians and also the ground that they are on will be full of swarms of flies. 18. And I shall sever in that day the land of Goshen, in which My people dwell, so no swarms of Flies will be there, so you will know that I AM the LORD* in the midst of the earth. 19. And I shall put a division between My people and your people. This sign will happen tomorrow.”