Exodus 10:16-20

Then Pharaoh hurriedly called for Moses and Aaron, and he said, “I have sinned against the LORD your God and against you. Now therefore, please forgive my sin only this once, and make supplication to the LORD your God, that He would only remove this death from me.” He went out from Pharaoh and made supplication to the LORD. So the LORD shifted the wind to a very strong west wind which took up the locusts and drove them into the Red Sea; not one locust was left in all the territory of Egypt. But the LORD hardened Pharaoh’s heart, and he did not let the sons of Israel go.