Exodus 8:21

8:21 If you do not release my people, then I am going to send swarms of flies on you and on your servants and on your people and in your houses. The houses of the Egyptians will be full of flies, and even the ground they stand on.

Psalms 78:45

78:45 He sent swarms of biting insects against them,

as well as frogs that overran their land.

Psalms 105:31

105:31 He ordered flies to come;

gnats invaded their whole territory.