Exodus 10:21-23

GOD said to Moses: “Stretch your hand to the skies. Let darkness descend on the land of Egypt—a darkness so dark you can touch it.” Moses stretched out his hand to the skies. Thick darkness descended on the land of Egypt for three days. Nobody could see anybody. For three days no one could so much as move. Except for the Israelites: they had light where they were living.