18. He went out from Pharaoh and made supplication to the Lord.
19. 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.
20. But the Lord hardened Pharaoh's heart, and he did not let the sons of Israel go.
21. Then the Lord said to Moses, "Stretch out your hand toward the sky, that there may be darkness over the land of Egypt, even a darkness which may be felt."
22. So Moses stretched out his hand toward the sky, and there was thick darkness in all the land of Egypt for three days.