Exodus 8:19-21

Amplified Bible

¹⁹ Then the magicians said to Pharaoh, “This is the [supernatural] finger of God.” But Pharaoh’s heart was hardened and he would not listen to them, just as the Lord had said.

²⁰ Now the Lord said to Moses, “Get up early in the morning and stand before Pharaoh as he is coming out to the water [of the Nile], and say to him, ‘Thus says the Lord, “Let My people go, so that they may serve Me. ²¹ 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.