Exodus 8:21

But if thou art not letting my people go, behold me! sending forth - against thee, and against thy servants, and against thy people, and against thy houses the gad-fly, - and the houses of the Egyptians shall be full of the gad-fly, moreover also the ground whereon, they are:

Psalm 78:45

He sent among them, The gad-fly, and it devoured them, And the frog, and it despoiled them;

Psalm 105:31

He spake, and there came in the gad-fly, Gnats, in all their bounds;

Isaiah 7:18

And it shall come to pass in that day that Yahweh will give a signal - To the fly that is in the uttermost part of the Nile-canals of Egypt, And to 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, The gad-fly, and it devoured them, And the frog, and it despoiled them;
Psalm 105:31
He spake, and there came in the gad-fly, Gnats, in all their bounds;
Isaiah 7:18
And it shall come to pass in that day that Yahweh will give a signal - To the fly that is in the uttermost part of the Nile-canals of Egypt, And to the bee that is in the land of Assyria.