The prophet saith, let favour be showed to the wicked yet will he not learn righteousness. But when the Lord's judgments are in the earth the inhabitants of the world will learn righteousness. Isaiah 26:9-10. Compare this conduct of Pharaoh's with what is related of him Exodus 10:28.
Related Commentaries of Exodus 12:31
Exodus 12:31-32
31 And he called for Moses and Aaron by night, and said, Rise up, and get you forth from among my people, both ye and the children of Israel; and go, serve the LORD, as ye have said.
32 Also take your flocks and your herds, as ye have said, and be gone; and bless me also.