When Pharaoh demands of you, “Produce a sign or wonder,” you will say to Aaron: “Take your staff and throw it down before Pharaoh, and it will turn into a serpent.”
So Moses stretched out his staff over the land of Egypt, and the Lord drove an east wind over the land all that day and all night. When it was morning, the east wind brought the locusts.
So Moses stretched out his staff toward the sky, and the Lord sent forth peals of thunder and hail. Lightning flashed toward the earth, and the Lord rained down hail upon the land of Egypt.
Say to him: Thus says the Lord God: Pay attention! I am against you, Pharaoh, king of Egypt, Great dragon crouching in the midst of the Nile, Who says, “The Nile belongs to me; I made it myself!”
but if I perform them, even if you do not believe me, believe the works, so that you may realize [and understand] that the Father is in me and I am in the Father.”