Exodus 10:19-21

Revised Standard Version

¹⁹ And the Lord turned 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. ²⁰ But the Lord hardened Pharaoh’s heart, and he did not let the children of Israel go.

The Ninth Plague: Darkness

²¹ Then 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.”