Exodus 8:24
And the LORD did so: that there came a grievous swarm of flies into the house of Pharaoh and into his slaves' houses and into all the land of Egypt; and the land was corrupted by reason of the swarm of flies.
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.
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.