20 Now the Lord said to Moses, “aRise early in the morning and present yourself before Pharaoh, 1as bhe comes out to the water, and say to him, ‘Thus says the Lord, “cLet My people go, that they may serve Me.

21 “For if you do not 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 dwell.

22 “aBut on that day I will set apart the land of Goshen, where My people are 1living, so that no swarms of flies will be there, in order that you may know that 2bI, the Lord, am in the midst of the land.

23 “I will 1put a division between My people and your people. Tomorrow this sign will occur.” ’ ”

24 Then the Lord did so. And there came 1great swarms of flies into the house of Pharaoh and the houses of his servants and the land was alaid waste because of the swarms of flies in all the land of Egypt.