Exodus 8:8-10

The king called for Moses and Aaron and said, “Pray to the LORD to take the frogs away from me and my people. I will let your people go to offer sacrifices to the LORD.” Moses said to the king, “Please set the time when I should pray for you, your people, and your officers. Then the frogs will leave you and your houses and will remain only in the Nile.” The king answered, “Tomorrow.” Moses said, “What you want will happen. By this you will know that there is no one like the LORD our God.