Exodus 10:20-22

21st Century King James Version

²⁰ But the Lord hardened Pharaoh’s heart, so that he would not let the children of Israel go.

²¹ And the Lord said unto Moses, “Stretch out thine hand toward heaven, that there may be darkness over the land of Egypt, even darkness which may be felt.”

²² And Moses stretched forth his hand toward heaven, and there was a thick darkness in all the land of Egypt three days.