7.3 I will harden Pharoah's heart... God seems happy to take responsibility for things that we are sometimes reluctant to give Him credit for.
7.12 Still Pharaoh's heart was hardened and he would not listen to them... Oh how we hang on so to our egos with the slimmest justification.
7.22 So Pharaoh's heart remained hardened, and he would not listen... The magician's ablility to duplicate it on a small scale was just enough justification.
7.23 he did not take even this to heart...
8.15 But when Pharaoh saw that there was respite, he hardened his heart and would not listen...as the Lord had said. Romans 2.4
8.32 Pharaoh hardened his heart this time also... Even after begging for a respite in verse thirty-two, he hunkers down into his stubborness. The more we say "no" to God the easier and more comfortable it gets.
9.12 the Lord hardened the heart of Pharaoh and he did not listen... This is the first time since 7.3 before the plagues started that if mentions God being the agent.
9.20 and whoever feared the Word of the Lord among the servants of Pharaoh hurried... I see the word fear hear being of close relation to believe (in a heartfelt, but cognitive sense) and dread. I doubt there was any worship going on here. also note that they are said to fear God's word and not God himself.
9.27 This time I have sinned; the Lord is in the right... Strong's H2398 - chata': to miss (like an archer) like hamartia in the NT or wander away when said to be against someone. Also, to become liable to a penalty or forfeiture. The later would seem more likely to me sense there seems to no true sense of guilt in his hardened state. It still seems like a remarkable statement from Pharaoh.
9.34 he sinned yet again and hardened his heart, he and his servants. The hardening is linked with repeated sinning. He is described as doing it to himself. His servants are with him in this attitude. I guess that misery is not the only thing that loves company.
9.35 So the heart of Pharaoh was hardened and he did not... We are well into a vicious cycle here.
10.7 How long shall this man be a snare to us? Pharaoh's servants are beginning to feel the sting of the plagues and its effect on their profit loss statements.
10.20 the Lord hardened Pharaoh's heart...
10.17 only this once... Now he is starting to sound pretty pitiful.
10.27 the Lord hardened Pharaoh's heart...
11.10 the Lord hardened Pharaoh's heart...