Exodus 9:27-35

The king sent for Moses and Aaron and told them, “This time I have sinned. The LORD is in the right, and I and my people are in the wrong. Pray to the LORD. We have had enough of God’s thunder and hail. I will let you go; you do not have to stay here any longer.” Moses told the king, “When I leave the city, I will raise my hands to the LORD in prayer, and the thunder and hail will stop. Then you will know that the earth belongs to the LORD. But I know that you and your officers do not yet fear the LORD God.” The flax was in bloom, and the barley had ripened, so these crops were destroyed. But both wheat crops ripen later, so they were not destroyed. Moses left the king and went outside the city. He raised his hands to the LORD, and the thunder and hail stopped. The rain also stopped falling to the ground. When the king saw that the rain, hail, and thunder had stopped, he sinned again, and he and his officers became stubborn. So the king became stubborn and refused to let the Israelites go, just as the LORD had said through Moses.