Exodus 9:27-30

27Then Pharaoh sent for Moses and Aaron, and said to them, “I have sinned this time; the Lord is righteous, and I and my people are wicked.

28Pray and entreat the Lord, for there has been enough of God’s thunder and hail; I will let you go, and you shall stay here no longer.”

29Moses said to him, “As soon as I leave the city, I will stretch out my hands to the Lord; the thunder will cease and there will be no more hail, so that you may know [without any doubt] and acknowledge that the earth is the Lord’s.

30But as for you and your servants, I know that you do not yet fear the Lord God.”