Exodus 9:12

12 And the Lord made hard the heart of Pharaoh, and he heard not them, as the Lord spake to Moses. (But the Lord hardened Pharaoh's heart, and he would not listen to them, as the Lord had said to Moses.)

Exodus 9:12 Meaning and Commentary

Exodus 9:12

And the Lord hardened the heart of Pharaoh
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, ( Exodus 4:21 ) ( 7:4 ) .

Exodus 9:12 In-Context

10 And they took ashes of a chimney, and they stood before Pharaoh; and Moses sprinkled it into heaven; and wounds of swelling bladders were made in men, and in work beasts; (And so they took some ashes from a chimney, and they stood before Pharaoh; and Moses tossed it into the air; and sores of swelling boils were made on the people, and on the work beasts;)

11 and the witches might not stand before Moses, for the wounds, or sores, that were in them, and in all the land of Egypt. (and the witches could not stand up before Moses, because of the sores that were on them, and on all the Egyptians.)

12 And the Lord made hard the heart of Pharaoh, and he heard not them, as the Lord spake to Moses. (But the Lord hardened Pharaoh's heart, and he would not listen to them, as the Lord had said to Moses.)

13 Also the Lord said to Moses, Rise thou early, and stand before Pharaoh, and thou shalt say to him, The Lord God of Hebrews saith these things, Deliver thou my people, that it make sacrifice to me; (And the Lord said to Moses, Rise thou up early, and stand before Pharaoh, and thou shalt say to him, The Lord God of the Hebrews saith these things, Let my people go, so that they can worship me;)

14 for in this time I shall send all my vengeances on thine heart, and on thy servants, and on thy people, that thou know, that none is like me in all [the] earth. (for at this time I shall send all my plagues onto thee, and onto thy servants, and onto thy people, so that thou know, that there is no one like me in all the earth.)