Exodus 8:9-10

9Moses said to Pharaoh, “I leave to you the honor of setting the time for me to pray for you and your officials and your people that you and your houses may be rid of the frogs, except for those that remain in the Nile.”

10“Tomorrow,” Pharaoh said. Moses replied, “It will be as you say, so that you may know there is no one like the LORD our God.