But on that day I will set apart the land of Goshen, where my people dwell, so that no swarms of flies shall be there, that you may know that I am the LORD in the midst of the earth.
22. And I will sever. Although this had not been expressly declared as yet, still it must be extended to the other plagues; for it is certain, that when God inflicted punishment on the Egyptians, He did not proceed promiscuously against all men; and, therefore, that His chosen people, in whose behalf He acted, were free from all inconvenience.
Here is the story of the plague of flies, in which we are told, I. How it was threatened, like that of frogs, before it was inflicted. Moses is directed (Exo 8:20) to rise early in the morning, to meet Pharaoh when he came forth to the water, and there to repeat his demands. Note, 1.
Commenting on Exodus 8:20-32
And I will put a division between my people and thy people,.... Or, a "redemption" (p); for by distinguishing them in his providence from the Egyptians, he might be said to redeem or deliver them; thus God makes a difference between his chosen people and the rest of the world, through his Son's redemption of them by his blood, out of every kindred, tongue, people...