Exo 8:21 Or else, if you will not let my people go, behold, I will send swarms of flies on you and your servants and your people, and into your houses. And the houses of the Egyptians shall be filled with swarms of flies, and also the ground on which they stand.
Exo 8:22 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.
Exo 8:24 And the Lord did so. There came great swarms of flies into the house of Pharaoh and into his servantshouses. Throughout all the land of Egypt the land was ruined by the swarms of flies.

Exo 8:29 Then Moses said, “Behold, I am going out from you and I will plead with the Lord that the swarms of flies may depart from Pharaoh, from his servants, and from his people, tomorrow. Only let not Pharaoh cheat again by not letting the people go to sacrifice to the Lord.”
Exo 8:31 And the Lord did as Moses asked, and removed the swarms of flies from Pharaoh, from his servants, and from his people; not one remained.
Psa 78:45 He sent among them swarms of flies, which devoured them,
and frogs, which destroyed them.
Psa 105:31 He spoke, and there came swarms of flies,
and gnats throughout their country.
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