Exodus 10:19

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.”