Exodus 10:19-21

19And the LORD changed the wind to a very strong west wind that carried off the locusts and blew them into the Red Sea.1 Not a single locust remained anywhere in Egypt.

20But the LORD hardened2 Pharaoh’s heart, and he would not let the Israelites go.

21Then the LORD said to Moses, “Stretch out your hand toward heaven, so that darkness may spread over the land of Egypt—a palpable darkness.”