Exodus 10:21-23

Then the LORD said to Moses, “Stretch out your hand toward the sky, so that darkness may come over the land of Egypt, a darkness which [is so awful that it] may be felt.” So Moses stretched out his hand toward the sky, and for three days a thick darkness was all over the land of Egypt [no sun, no moon, no stars]. The Egyptians could not see one another, nor did anyone leave his place for three days, but all the Israelites had [supernatural] light in their dwellings.