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 even one of the Israelites’ livestock had died. But the heart of Pharaoh was hardened, and he would not let the people go.
Why, O Lord, do you let us stray from your ways and let our heart harden, so that we do not fear you? Turn back for the sake of your servants, 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?