Exodus 10:20-22

New Revised Standard Version Catholic Edition

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 toward heaven so that there may be darkness over the land of Egypt, a darkness that can be felt.” ²² So Moses stretched out his hand toward heaven, and there was dense darkness in all the land of Egypt for three days.