Exodus 10:16-20

16Then Pharaoh quickly called Moses and Aaron to come to him. He said, ‘I have done bad things against the Lord your God and against you.

17Please forgive my sins just one more time. Ask the Lord your God to remove this punishment of death from me.’

18Moses left Pharaoh and he prayed to the Lord.

19Then the Lord changed the wind to a very strong west wind. This wind lifted the locusts up and it blew them away into the Red Sea. Not one locust remained in all the country of Egypt.

20But the Lord caused Pharaoh's mind to become hard again. Pharaoh would not let the Israelites go.