And I will harden the heart of the Egyptians to pursue you: and I will be glorified in Pharao, and in all his host, and in his chariots, and in his horsemen.
But according to thy hardness and impenitent heart, thou treasurest up to thyself wrath, against the day of wrath, and revelation of the just judgment of God.
Therefore Moses and Aaron went in to Pharao, and said to him: Thus saith the Lord God of the Hebrews: How long refusest thou to submit to me? Let my people go, to sacrifice to me.
And the Lord said to him as he was returning into Egypt: See that thou do all the wonders before Pharao, which I have put in thy hand. I shall harden his heart, and he will not let the people go.