Exodus 10:16-20

16Then Pharaoh called for Moses and Aaron in haste; and he said, I have sinned against Jehovah your God, and against you. 17Now therefore forgive, I pray thee, my sin only this once, and entreat Jehovah your God, that he may take away from me this death only. 18And he went out from Pharaoh, and entreated Jehovah. 19And Jehovah turned an exceeding strong west wind, which took up the locusts, and drove them into the Red Sea; there remained not one locust in all the border of Egypt. 20But Jehovah hardened Pharaoh’s heart, and he did not let the children of Israel go.