Exodus 10:18-20

Revised Standard Version Catholic Edition

¹⁸ So he went out from Pharaoh, and entreated the Lord. ¹⁹ And the Lord turned a very strong west wind, which lifted the locusts and drove them into the Red Sea; not a single locust was left in all the country of Egypt. ²⁰ But the Lord hardened Pharaoh’s heart, and he did not let the children of Israel go.