Exodus 8:7-9

7And the magicians did so with their enchantments, and brought up frogs on the land of Egypt.

8Then Pharaoh called for Moses and Aaron, and said, “Entreat the Lord that He may take away the frogs from me and from my people; and I will let the people go, that they may sacrifice to the Lord.”

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.”