Exodus 9:33-35

Revised Standard Version Catholic Edition

³³ So Moses went out of the city from Pharaoh, and stretched out his hands to the Lord; and the thunder and the hail ceased, and the rain no longer poured upon the earth. ³⁴ But when Pharaoh saw that the rain and the hail and the thunder had ceased, he sinned yet again, and hardened his heart, he and his servants. ³⁵ So the heart of Pharaoh was hardened, and he did not let the people of Israel go; as the Lord had spoken through Moses.