Exodus 8:8

8:8 Then Pharaoh summoned Moses and Aaron and said, “Pray to the Lord that he may take the frogs away from me and my people, and I will release the people that they may sacrifice to the Lord.”

Exodus 8:28

8:28 Pharaoh said, “I will release you so that you may sacrifice to the Lord your God in the desert. Only you must not go very far. Do pray for me.”