And the Lord said to Moses, “When you go back to Egypt, see that you perform before Pharaoh all the wonders that I have put in your power; but I will harden his heart, so that he will not let the people go.
Then Pharaoh called Moses and Aaron, and said, “Pray to the Lord to take away the frogs from me and my people, and I will let the people go to sacrifice to the Lord.”
Pharaoh inquired and found that not one of the livestock of the Israelites was dead. But the heart of Pharaoh was hardened, and he would not let the people go.
Why, O Lord, do you make us stray from your ways and harden our heart, so that we do not fear you? Turn back for the sake of your servants, for the sake of the tribes that are your heritage.
Why should you harden your hearts as the Egyptians and Pharaoh hardened their hearts? After he had made fools of them, did they not let the people go, and they departed?