Exodus 8:21

For if thou wilt not let my people go, behold, I will send swarms of flies upon thee and upon thy slaves and upon thy people and into thy houses; and the houses of the Egyptians shall be full of all kinds of flies and also the ground upon which they are.

Psalm 78:45

He sent swarms of flies among them, which devoured them, and frogs, which destroyed them.

Psalm 105:31

He spoke, and swarms of flies and lice came within all their borders.

Isaiah 7:18

And it shall come to pass in that day, that the LORD shall hiss for the fly that is in the uttermost part of the rivers of Egypt and for the bee that is in the land of Assyria.

Treasury of Scripture Knowledge

Summary

Else, if thou wilt not let my people go, behold, I will send swarms of flies upon thee, and upon thy servants, and upon thy people, and into thy houses: and the houses of the Egyptians shall be full of swarms of flies, and also the ground whereon they are.

Bible References

Swarms

Psalm 78:45
He sent swarms of flies among them, which devoured them, and frogs, which destroyed them.
Psalm 105:31
He spoke, and swarms of flies and lice came within all their borders.
Isaiah 7:18
And it shall come to pass in that day, that the LORD shall hiss for the fly that is in the uttermost part of the rivers of Egypt and for the bee that is in the land of Assyria.