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The Eighth Plague: Locusts
21Then the Lord said to Moses, “Stretch out your hand toward heaven, that there may be darkness over the land of Egypt, darkness which may even be felt.” 22So Moses stretched out his hand toward heaven, and there was thick darkness in all the land of Egypt three days. 23They did not see one another; nor did anyone rise from his place for three days. But all the children of Israel had light in their dwellings.
Exodus 10:21-23 (NKJV)