There is no such verse in Exodus. According to the NIV Exhaustive Concordance compiled by Edward W Goodrick & John R. Kohlenberg III there isn't even a verse close (either in word choice or theme) contained in Exodus. If you encountered this verse at all, it was a very bad misquotation.
In the majority of the Plagues, Pharaoh hardened his own heart. Only in a few of the later plagues did God harden Pharaoh's heart. These later cases were a punishment for Pharaoh having hardened his own heart while he still had free will.
Exodus 4:21 and then all consistently throughout Exodus chapters 7-14.
He hardened his heart and refused to let the Israelites go (Exodus ch.8). See also:More about the Exodus
At first, he made a conscious decision to refuse to permit the freeing of the Israelites. In a few of the later plagues, God Himself hardened Pharaoh's heart, for a reason given in Exodus ch.10.
During the Exodus, the Pharaoh is the ruler of Egypt who opposes Moses and the Israelites' departure from slavery. Traditionally identified as Ramses II in many interpretations, the Pharaoh's hardened heart leads to a series of plagues inflicted upon Egypt by God, ultimately culminating in the Exodus of the Israelites. His refusal to let the people go signifies the struggle between divine will and human authority.
The plagues which God brought upon Egypt (Exodus ch.7-12).
In the Old Testament book of Exodus: Exo 9:7 Then Pharaoh sent, and indeed, not even one of the livestock of the Israelites was dead. But the heart of Pharaoh became hard, and he did not let the people go.
On the contrary. Read the verses carefully (Exodus ch. 7 to 12) and you'll see that God hardened Pharaoh's heart on only three occasions (Exodus 9:12, and 10:20 and 27), and only after five Plagues had passed in which Pharaoh hardened his own heart. That itself explains the reason. After a person misuses his free-will repeatedly, he sometimes sees it diminished (like a person who has ruined his health through bad habits and is warned to henceforth stay away from alcohol, or sweets, etc).See also:Evidence of the ExodusReliability of the Hebrew Bible
1) They were supplying free labor.2) At first he was simply stubborn on his own account. The fact that he asked his necromancers to replicate the early Plagues (Exodus ch.7) shows that he didn't want to believe. Later, as a punishment, God Himself hardened Pharaoh's heart (Exodus ch.9).
That is not stated. What is stated, is how Pharaoh and his advisers reacted to the plagues. In the majority of the plagues, Pharaoh hardened his own heart; and in the first two, even his advisers did the same. Only later did their attitude soften. See Exodus chapters 7-12.
It means that Pharaoh increased his stubbornness.
This final great plague upon the Egyptians led them to exclaim 'we be all dead men.' Thus, since the plagues had virtually ruined Egypt's economy, and now death was striking the people they wanted to be rid of these Israelites and that as quickly as possible. Since the first born was struck down Amenhotep II's firstborn son did not ascend the throne. It seems clear that Thutmose IV who ascended the throne after this was not the firstborn as would normally have been the case. 29And it came to pass, that at midnight the LORD smote all the firstborn in the land of Egypt, from the firstborn of Pharaoh that sat on his throne unto the firstborn of the captive that was in the dungeon; and all the firstborn of cattle. 30And Pharaoh rose up in the night, he, and all his servants, and all the Egyptians; and there was a great cry in Egypt; for there was not a house where there was not one dead. 31And 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. 32Also take your flocks and your herds, as ye have said, and be gone; and bless me also. 33And the Egyptians were urgent upon the people, that they might send them out of the land in haste; for they said, We be all dead men. Because the Pharaoh got tired of the Hebrew God messing with his heart.. ; Exodus 4:21 : And the LORD said unto Moses, When thou goest to return into Egypt, see that thou do all those wonders before Pharaoh, which I have put in thine hand: but I will harden his heart, that he shall not let the people go. ; Exodus 7:3 : And I will harden Pharaoh's heart, and multiply my signs and my wonders in the land of Egypt. ; Exodus 7:13 : And he hardened Pharaoh's heart, that he hearkened not unto them; as the LORD had said. ; Exodus 9:12 : And the LORD hardened the heart of Pharaoh, and he hearkened not unto them; as the LORD had spoken unto Moses. ; Exodus 10:1 : And the LORD said unto Moses, Go in unto Pharaoh: for I have hardened his heart, and the heart of his servants, that I might shew these my signs before him: ; Exodus 10:20 : But the LORD hardened Pharaoh's heart, so that he would not let the children of Israel go. ; Exodus 10:27 : But the LORD hardened Pharaoh's heart, and he would not let them go. ; Exodus 11:10 : And Moses and Aaron did all these wonders before Pharaoh: and the LORD hardened Pharaoh's heart, so that he would not let the children of Israel go out of his land. ; Exodus 14:4 : And I will harden Pharaoh's heart, that he shall follow after them; and I will be honoured upon Pharaoh, and upon all his host; that the Egyptians may know that I am the LORD. ; Exodus 14:8 : And the LORD hardened the heart of Pharaoh king of Egypt, and he pursued after the children of Israel ; Exodus 14:17 : I will harden the hearts of the Egyptians, and they shall follow them: and I will get me honour.