Exodus 10:19 YLT

¹⁷  and now, bear with, I pray you, my sin, only this time, and make ye supplication to Jehovah your God, that He turn aside from off me only this death.'

¹⁸  And he goeth out from Pharaoh, and maketh supplication unto Jehovah,

¹⁹  and Jehovah turneth a very strong sea wind, and it lifteth up the locust, and bloweth it into the Red Sea -- there hath not been left one locust in all the border of Egypt;

²⁰  and Jehovah strengtheneth the heart of Pharaoh, and he hath not sent the sons of Israel away.

²¹  And Jehovah saith unto Moses, 'Stretch out thy hand towards the heavens, and there is darkness over the land of Egypt, and the darkness is felt.'