Exodus 10:18-20

Young's Literal Translation

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.