Exodus 9:12

12 And the Lord hardened Pharao's heart, and he hearkened not to them, as the Lord appointed.

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 So he took of the ashes of the furnace before Pharao, and Moses scattered it toward heaven, and it became sore blains breaking forth both on men and on beasts.
11 And the sorcerers could not stand before Moses because of the sores, for the sores were on the sorcerers, and in all the land of Egypt.
12 And the Lord hardened Pharao's heart, and he hearkened not to them, as the Lord appointed.
13 And the Lord said to Moses, Rise up early in the morning, and stand before Pharao; and thou shalt say to him, These things saith the Lord God of the Hebrews, Send away my people that they may serve me.
14 For at this present time do I send forth all my plagues into thine heart, and the heart of thy servants and of thy people; that thou mayest know that there is not another such as I in all the earth.

The Brenton translation of the Septuagint is in the public domain.