Exodus 10:19-21

Darby Translation

¹⁹ And Jehovah turned a very powerful west wind, which took away the locusts, and drove them into the Red Sea: there remained not one locust in all the borders of Egypt.

²⁰ And Jehovah made Pharaoh's heart stubborn, and he did not let the children of Israel go.

²¹ And Jehovah said to Moses, Stretch out thy hand toward the heavens, that there may be darkness in the land of Egypt—so that one may feel darkness.