Exodus 10:19-21

New Revised Standard Version, Anglicised Catholic Edition

¹⁹ The Lord changed the wind into a very strong west wind, which lifted the locusts and drove them into the Red Sea;^[a] not a single locust was left in all the country of Egypt. ²⁰ But the Lord hardened Pharaoh’s heart, and he would not let the Israelites go.

The Ninth Plague: Darkness

²¹ Then the Lord said to Moses, ‘Stretch out your hand towards heaven so that there may be darkness over the land of Egypt, a darkness that can be felt.’