וַאֲנִ֥י אַקְשֶׁ֖ה אֶת־לֵ֣ב פַּרְעֹ֑ה וְהִרְבֵּיתִ֧י אֶת־אֹתֹתַ֛י וְאֶת־מוֹפְתַ֖י בְּאֶ֥רֶץ מִצְרָֽיִם׃
Ja zaś ukrnąbrnię serce Faraona, i rozmnożę znaki Moje i cuda Moje w ziemi Micraim.
Rashi
ואני אקשה AND I WILL ALLOW [PHARAOH’S HEART] TO HARDEN — Since he has wickedly resisted Me, and it is manifest to Me that the heathen nations find no spiritual satisfaction in setting their whole heart to return to Me penitently, it is better that his heart should be hardened in order that My signs may be multiplied against him so that ye may recognise My divine power. Such, indeed, is the method of the Holy One, blessed be He: He brings punishment upon the nations so that Israel may hear of it and fear Him, as it is said, (Zephaniah 3:6, 3:7) “I have cut off nations, their corners are desolate etc. … I said: Surely thou wilt fear Me, thou wilt receive correction” (cf. Yevamot 63a). Nevertheless, in the case of the first five plagues it is not stated, “The Lord hardened Pharaoh’s heart” but “Pharaoh’s heart was hardened” (Midrash Tanchuma, Vaera 3).
Chizkuni
ואני אקשה, “and I (G-d) will toughen;” Rashi points out that during the first five plagues G-d actually did not yet harden Pharaoh’s heart, and the Torah only speaks about vayechezak lev paroh, meaning that Pharaoh “remained obstinate without any help from G-d.” When the Torah writes during the seventh plague, the plague of hail in chapter 9 verse 35, that vayechezak lev paroh, that “Pharaoh’s heart remained obstinate,” which appears to contradict what Rashi said, seeing that line occurs during the seventh plague, this line appears after in verse 34, G-d had already hardened his heart. In that instance, for the first time, Pharaoh had admitted being guilty, and after G-d had hardened his heart he was able to hold out still longer in his obstinate ways. In chapter 10,1, G-d explains to Moses that Pharaoh’s behaviour from then on was understandable only because He had already hardened his heart. He was already no longer a free agent. The reason is simple, as Rashi explains. Once a person has remained obstinate in the face of five plagues clearly orchestrated by G-d, he is deprived of his most precious attribute, that of freedom of choice. Even if Pharaoh had freed the Israelites at that stage, G-d would not have let him, until He had been able to demonstrate Hjs powers completely.
Ramban
AND I WILL HARDEN PHARAOH’S HEART. The Rabbis said in Midrash Rabbah:94Shemoth Rabbah 5:6. “G-d revealed to Moses that He was destined to harden Pharaoh’s heart in order to bring judgment upon him for he caused them to work in cruel bondage.” It is also stated there [in Midrash Rabbah]:95Ibid., 13:4. “For I have hardened his heart.96Further, 10:1. Rabbi Yochanan said, ‘This provides a pretext for the heretics to say that G-d did not allow Pharaoh to repent.’ Rabbi Shimon ben Lakish said, ‘The mouths of the heretics be closed! Only, if it concerneth the scorners, He scorneth them.97Proverbs 3:34. When He warns one on three occasions and he does not turn from his ways, He closes the door of repentance on him in order to punish him for his sin. Such was the case with wicked Pharaoh. After the Holy One, blessed be He, sent him five times98“In the case of the first five plagues, it is not stated, ‘The Eternal hardened Pharaoh’s heart,’ but ‘Pharaoh’s heart was hardened’” (Rashi). That is, it was hardened by his own stubborness. [the request to let His people go] and he paid no attention to His words, the Holy One, blessed be He, said to him: You have stiffened your neck and hardened your heart; I will double your defilement.’”99Literally: “I will add defilement to your defilement.”
The Rabbis [in the above Midrash] have thus discussed the question which all ask:100See Ibn Ezra here, and Rambam in his Shemonah Perakim, Chapter 8, and in his Mishneh Torah, Hilchoth Teshubah 6:3, where this problem is discussed. “If G-d hardened his heart, what then was Pharaoh’s sin?” For this there are two explanations, and both of them are true. One is that Pharaoh in his wickedness had unjustifiably perpetrated such great evils against Israel that justice required that the ways of repentance be withheld from him, as is so indicated in many places in the Torah and in the Writings.101See Rambam in Mishneh Torah, ibid., where he quotes from the Prophets and Writings to substantiate this point. He was judged according to his wickedness which he had originally committed of his own will. The second explanation is that half of the plagues came upon him because of his transgressions, for in connection with them it is only said: And Pharaoh’s heart was hardened;102Further, Verses 13 and 22, and 8:15. And Pharaoh hardened his heart.103Ibid., 8:28 and 9:7. Thus Pharaoh refused to let the children of Israel go for the glory of G-d. But when the plagues began bearing down upon him and he became weary to suffer them, his heart softened and he bethought himself to send them out on account of the onslaught of the plagues, not in order to do the will of his Creator. Then G-d hardened his spirit and made his heart obstinate,104Deuteronomy 2:30. so that His name may be declared [throughout all the earth].105Further, 9:16. Similar in meaning is the verse, Thus will I magnify Myself, and sanctify Myself, and I will make Myself known in the eyes of many nations, and they shall know that I am the Eternal.106Ezekiel 38:23. And that which He said before the plagues, And I will harden his heart, and he will not let the people go,107Above, 4:21. was merely His warning to Moses of that which He was destined to do to Pharaoh in the last [five] plagues, it being similar to that which He said, And I know that the king of Egypt will not give you leave to go.108Ibid., 3:19. This then is the meaning of the verse [before us], And I will harden Pharaoh’s heart, and multiply My signs. That is to say, “I will harden his heart so that My wonders may be multiplied in the land of Egypt,”109Further, 11:9. since in the last five plagues, as well as at the drowning in the sea, it is said, And the Eternal hardened the heart of Pharaoh,110Ibid., 14:8. for the king’s heart is in the hand of the Eternal; He turneth it whithersoever He will.111Proverbs 21:1.
The Rabbis [in the above Midrash] have thus discussed the question which all ask:100See Ibn Ezra here, and Rambam in his Shemonah Perakim, Chapter 8, and in his Mishneh Torah, Hilchoth Teshubah 6:3, where this problem is discussed. “If G-d hardened his heart, what then was Pharaoh’s sin?” For this there are two explanations, and both of them are true. One is that Pharaoh in his wickedness had unjustifiably perpetrated such great evils against Israel that justice required that the ways of repentance be withheld from him, as is so indicated in many places in the Torah and in the Writings.101See Rambam in Mishneh Torah, ibid., where he quotes from the Prophets and Writings to substantiate this point. He was judged according to his wickedness which he had originally committed of his own will. The second explanation is that half of the plagues came upon him because of his transgressions, for in connection with them it is only said: And Pharaoh’s heart was hardened;102Further, Verses 13 and 22, and 8:15. And Pharaoh hardened his heart.103Ibid., 8:28 and 9:7. Thus Pharaoh refused to let the children of Israel go for the glory of G-d. But when the plagues began bearing down upon him and he became weary to suffer them, his heart softened and he bethought himself to send them out on account of the onslaught of the plagues, not in order to do the will of his Creator. Then G-d hardened his spirit and made his heart obstinate,104Deuteronomy 2:30. so that His name may be declared [throughout all the earth].105Further, 9:16. Similar in meaning is the verse, Thus will I magnify Myself, and sanctify Myself, and I will make Myself known in the eyes of many nations, and they shall know that I am the Eternal.106Ezekiel 38:23. And that which He said before the plagues, And I will harden his heart, and he will not let the people go,107Above, 4:21. was merely His warning to Moses of that which He was destined to do to Pharaoh in the last [five] plagues, it being similar to that which He said, And I know that the king of Egypt will not give you leave to go.108Ibid., 3:19. This then is the meaning of the verse [before us], And I will harden Pharaoh’s heart, and multiply My signs. That is to say, “I will harden his heart so that My wonders may be multiplied in the land of Egypt,”109Further, 11:9. since in the last five plagues, as well as at the drowning in the sea, it is said, And the Eternal hardened the heart of Pharaoh,110Ibid., 14:8. for the king’s heart is in the hand of the Eternal; He turneth it whithersoever He will.111Proverbs 21:1.