Exodus 9:12

“And the Lord hardened the heart of Pharaoh, etc.] He having often, and so long hardened his own heart, God gave him up to judicial hardness of heart, to his own corruptions, the temptations of Satan, and the lying magicians about him, to make an ill use of everything that offered to him, and put a wrong construction on all that befell him, so that whatever was said to him, or inflicted on him, made no impression to any purpose: and he hearkened not unto them; to Moses and Aaron, and to the Lord by them: as the Lord had spoken to Moses; both that he would harden his heart, and he should not hearken to them; all this was no other than what the Lord had said should be, (<020421>Exodus 4:21…”

“Now the Lord hardened Pharaoh's heart - Before he had hardened his own heart, and resisted the grace of God, and now God justly gave him up to his own heart's lusts, to strong delusions, permitting Satan to blind and harden him. Wilful hardness is commonly punished with judicial hardness. Let us dread this as the sorest judgment a man can be under on this side hell. Exodus 9:14”

“9:12 Plagues five and six apparently dissipated on their own, since there was no plea by Pharaoh to bring them to an end.”

“Exo 4:21, Exo 7:13, Exo 7:14; Psa 81:11, Psa 81:12; Rev 16:10, Rev 16:11; Hardness of heart is a figurative expression, denoting that insensibility of mind upon which neither judgments nor mercies make any abiding impressions; but the conscience being stupefied, the obdurate rebel persists in determined disobedience. Exodus 9:13”