Exodus 10:19-21

19Then Adonai turned the wind from the west, very strong, and it carried off the locusts and drove them into the Sea of Reeds. Not one locust remained in all the territory of Egypt.

20But Adonai hardened Pharaoh’s heart, and he did not let Bnei-Yisrael go.

21Then Adonai said to Moses, “Stretch out your hand toward heaven, and there will be darkness over the land of Egypt—a darkness that may be felt.”