Exodus 9:29-35

29 And Moses said, When I am gone outside the town, my hands will be stretched out to the Lord; the thunders and the ice-storm will come to an end, so that you may see that the earth is the Lord's.
30 But as for you and your servants, I am certain that even now the fear of the Lord God will not be in your hearts.
31 And the flax and the barley were damaged, for the barley was almost ready to be cut and the flax was in flower.
32 But the rest of the grain-plants were undamaged, for they had not come up.
33 So Moses went out of the town, and stretching out his hands made prayer to God: and the thunders and the ice-storm came to an end; and the fall of rain was stopped.
34 But when Pharaoh saw that the rain and the ice-storm and the thunders were ended, he went on sinning, and made his heart hard, he and his servants.
35 And the heart of Pharaoh was hard, and he did not let the people go, as the Lord had said by the mouth of Moses.
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