Exodus 10:18

14The locusts went up over all the land of Egypt, and rested in all the borders of Egypt. They were very grievous. Before them there were no such locusts as they, nor will there ever be again.

15For they covered the surface of the whole earth, so that the land was darkened, and they ate every herb of the land, and all the fruit of the trees which the hail had left. There remained nothing green, either tree or herb of the field, through all the land of Egypt.

16Then Pharaoh called for Moses and Aaron in haste, and he said, “I have sinned against the LORD your God, and against you.

17Now therefore please forgive my sin again, and pray to the LORD your God, that he may also take away from me this death.”

18Moses went out from Pharaoh, and prayed to the LORD.

19The LORD sent an exceedingly strong west wind, which took up the locusts, and drove them into the Red Sea. There remained not one locust in all the borders of Egypt.

20But the LORD hardened Pharaoh’s heart, and he didn’t let the children of Israel go.

21The LORD said to Moses, “Stretch out your hand toward the sky, that there may be darkness over the land of Egypt, even darkness which may be felt.”

22Moses stretched out his hand toward the sky, and there was a thick darkness in all the land of Egypt for three days.