Exodus 10:12-10:23
Then the Lord said to Moses, "Hold out your arm over the land of Egypt for the locusts, that they may come upon the land of Egypt and eat up all the grasses in the land, whatever the hail has left." So Moses held out his rod over the land of Egypt, and the Lord drove an east wind over the land all that day and all night; and when morning came, the east wind had brought the locusts. Locusts invaded all the land of Egypt and settled within all the territory of Egypt in a thick mass; never before had there been so many, nor will there ever be so many again. They hid all the land from view, and the land was darkened; and they ate up all the grasses of the field and all the fruit of the trees which the hail had left, so that nothing green was left, of tree or grass of the field, in all the land of Egypt.
Pharaoh hurriedly summoned Moses and Aaron and said, "I stand guilty before the Lord your God and before you. Forgive my offense just this once, and plead with the Lord your God that He but remove this death from me." So he left Pharaoh's presence and pleaded with the Lord. The Lord caused a shift to a very strong west wind, which lifted the locusts and hurled them into the Sea of Reeds; not a single locust remained in all the territory of Egypt. But the Lord stiffened Pharaoh's heart, and he would not let the Israelites go.
Then the Lord said to Moses, "Hold out your arm toward the sky that there may be darkness upon the land of Egypt, a darkness that can be touched." Moses held out his arm toward the sky and thick darkness descended upon all the land of Egypt for three days. People could not see one another, and for three days no one could get up from where he was; but all the Israelites enjoyed light in their dwellings.