Exodus 8:21

But if you are not [about to] release my people, look, I [am about] to send out flies among you and among your servants and among your people and in your houses; and the houses of Egypt will fill up with the flies and also the ground that they are on.

Psalm 78:45

He sent among them flies that devoured them and frogs that destroyed them.

Psalm 105:31

He spoke, and there came flies [and] gnats throughout all their territory.

Isaiah 7:18

And this shall happen: On that day, Yahweh will whistle for the fly that [is] at the end of the stream of Egypt and 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 among them flies that devoured them and frogs that destroyed them.
Psalm 105:31
He spoke, and there came flies [and] gnats throughout all their territory.
Isaiah 7:18
And this shall happen: On that day, Yahweh will whistle for the fly that [is] at the end of the stream of Egypt and the bee that [is] in the land of Assyria.