Exodus 8:9-10

9And Moses said to Pharaoh, “Accept the honor of saying when I shall intercede for you, for your servants, and for your people, to destroy the frogs from you and your houses, that they may remain in the river only.”

10So he said, “Tomorrow.” And he said, “Let it be according to your word, that you may know that there is no one like the Lord our God.