I shall harden, etc... not by being the efficient cause of his hardness of heart, but by permitting it; and by withdrawing grace from him, in punishment of his malice; which alone was the proper cause of his being hardened.
7:4. And he will not hear you: and I will lay my hand upon Egypt, and will bring forth my army and my people, the children of Israel, out of the land of Egypt, by very great judgments.
7:5. And the Egyptians shall know that I am the Lord, who have stretched forth my hand upon Egypt, and have brought forth the children of Israel out of the midst of them.
7:6. And Moses and Aaron did as the Lord had commanded; so did they.
7:7. And Moses was eighty years old, and Aaron eighty-three, when they spoke to Pharao.
7:8. And the Lord said to Moses and Aaron:
7:9. When Pharao shall say to you, Shew signs; thou shalt say to Aaron: Take thy rod, and cast it down before Pharao, and it shall be turned into a serpent.
7:10. So Moses and Aaron went in unto Pharao, and did as the Lord had commanded. And Aaron took the rod before Pharao and his servants, and it was turned into a serpent.
7:11. And Pharao called the wise men and the magicians; and they also by Egyptian enchantments and certain secrets, did in like manner.
Magicians... Jannes, and Mambres, or Jambres, 2 Tim. 3.8.