'Bloodsucking' in the Bible

For if you do not let My people go, hear this: I will send swarms of [bloodsucking] insects on you and on your servants and on your people and into your houses; and the houses of the Egyptians will be full of swarms of insects, as well as the ground on which they stand.

Then the Lord did so. And there came heavy and oppressive swarms of [bloodsucking] insects into the house of Pharaoh and his servants’ houses; in all the land of Egypt the land was corrupted and ruined because of the [great invasion of] insects.

Moses said, “I am going to leave you, and I will urgently petition (pray, entreat) the Lord that the swarms of insects may leave Pharaoh, his servants, and his people tomorrow; only do not let Pharaoh act deceitfully again by not letting the people go to sacrifice to the Lord.”