Exodus 8:24
And the LORD did so; and there came a grievous swarm of flies into the house of Pharaoh, and into his servants' houses, and into all the land of Egypt: 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 there came swarms of flies, and gnats in all their country.
Exodus 8:21
Else, if you will not let my people go, behold, I will send swarms of flies upon you, and upon your servants, and upon your people, and into your houses: and the houses of the Egyptians shall be full of swarms of flies, and also the ground on which they are.