Exodus 8:21

If thou wilt not let my people go, behold: I will send all manner flies both upon thee and thy servants, and thy people, and into thy houses. And the houses of the Egyptians shall be full of flies, and the ground whereon they are.

Psalm 78:45

How he sent lice among them, to eat them up, and frogs to destroy them;

Psalm 105:31

He spake the word, and there came all manner of flies and lice in all their quarters.

Isaiah 7:18

For at the same time shall the LORD whistle for the flies that are about the water of Egypt, and for the bees in the Assyrian land.

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
How he sent lice among them, to eat them up, and frogs to destroy them;
Psalm 105:31
He spake the word, and there came all manner of flies and lice in all their quarters.
Isaiah 7:18
For at the same time shall the LORD whistle for the flies that are about the water of Egypt, and for the bees in the Assyrian land.