Exodus 10:18-23
English Standard Version
Chapter 10
18So he went out from Pharaoh and pleaded with the Lord. 19And the Lord turned the wind into a very strong west wind, which lifted the locusts and drove them into the Red Sea. Not a single locust was left in all the country of Egypt. 20But the Lord hardened Pharaoh 's heart, and he did not let the people of Israel go.
21Then the Lord said to Moses, "Stretch out your hand toward heaven, that there may be darkness over the land of Egypt, a darkness to be felt."
22So Moses stretched out his hand toward heaven, and there was pitch darkness in all the land of Egypt three days.
23They did not see one another, nor did anyone rise from his place for three days, but all the people of Israel had light where they lived.
