Now, at last, Pharaoh acknowledged, and said, "The Lord is righteous, and I and my people are wicked. He was righteous when He bade us hasten in our cattle from before the hail, and I and my people were wicked, for we heeded not His warning, and men and beasts were found in the field by the hail, and slain." Again he begged Moses to supplicate God in his behalf, that He turn the plague away, and he promised to let the children of Israel go. Moses consented to do his will, saying, however: "Think not that I do not know what will happen after the plague is stayed. I know that thou and thy servants, ye will fear the Lord God, once His punishment is removed, as little as ye feared Him before. But to show His greatness, I will pray to Him to make the hail to cease."
Pharaoh — Moses and the Fires of Gehenna
Legends of the Jews 4:312