And I will sever in that day the land of Goshen, in which my people dwell, that no swarms of flies
shall be there; to the end thou mayest know that I am
the LORD in the midst of the earth.
And I will put a division between my people and thy people: to morrow shall this sign be.
And the LORD did so; and there came a grievous swarm of flies
into the house of Pharaoh, and into
his servants' houses, and into all the land of Egypt: the land was corrupted by reason of the swarm of flies
And Pharaoh called for Moses and for Aaron, and said, Go ye, sacrifice to your God in the land.