22:53
لِّ يَجْعَلَ مَا يُلْقِى ٱل شَّيْطَٰنُ فِتْنَةً لِّ لَّذِينَ فِى قُلُوبِ هِم مَّرَضٌ وَ ٱلْ قَاسِيَةِ قُلُوبُ هُمْ وَ إِنَّ ٱل ظَّٰلِمِينَ لَ فِى شِقَاقٍۭ بَعِيدٍ
[That is] so He may make what Satan throws in a trial for those within whose hearts is disease and those hard of heart. And indeed, the wrongdoers are in extreme dissension.
2:74
ثُمَّ قَسَتْ قُلُوبُ كُم مِّنۢ بَعْدِ ذَٰلِكَ فَ هِىَ كَ ٱلْ حِجَارَةِ أَوْ أَشَدُّ قَسْوَةً وَ إِنَّ مِنَ ٱلْ حِجَارَةِ لَ مَا يَتَفَجَّرُ مِنْ هُ ٱلْ أَنْهَٰرُ وَ إِنَّ مِنْ هَا لَ مَا يَشَّقَّقُ فَ يَخْرُجُ مِنْ هُ ٱلْ مَآءُ وَ إِنَّ مِنْ هَا لَ مَا يَهْبِطُ مِنْ خَشْيَةِ ٱللَّهِ وَ مَا ٱللَّهُ بِ غَٰفِلٍ عَ مَّا تَعْمَلُ ونَ
Then your hearts became hardened after that, being like stones or even harder. For indeed, there are stones from which rivers burst forth, and there are some of them that split open and water comes out, and there are some of them that fall down for fear of Allah. And Allah is not unaware of what you do.
39:22
أَ فَ مَن شَرَحَ ٱللَّهُ صَدْرَ هُۥ لِ لْ إِسْلَٰمِ فَ هُوَ عَلَىٰ نُورٍ مِّن رَّبِّ هِۦ فَ وَيْلٌ لِّ لْ قَٰسِيَةِ قُلُوبُ هُم مِّن ذِكْرِ ٱللَّهِ أُو۟لَٰٓئِكَ فِى ضَلَٰلٍ مُّبِينٍ
So is one whose breast Allah has expanded to [accept] Islam and he is upon a light from his Lord [like one whose heart rejects it]? Then woe to those whose hearts are hardened against the remembrance of Allah. Those are in manifest error.
57:16
أَ لَمْ يَأْنِ لِ لَّذِينَ ءَامَنُ وٓا۟ أَن تَخْشَعَ قُلُوبُ هُمْ لِ ذِكْرِ ٱللَّهِ وَ مَا نَزَلَ مِنَ ٱلْ حَقِّ وَ لَا يَكُونُ وا۟ كَ ٱلَّذِينَ أُوتُ وا۟ ٱلْ كِتَٰبَ مِن قَبْلُ فَ طَالَ عَلَيْ هِمُ ٱلْ أَمَدُ فَ قَسَتْ قُلُوبُ هُمْ وَ كَثِيرٌ مِّنْ هُمْ فَٰسِقُونَ
Has the time not come for those who have believed that their hearts should become humbly submissive at the remembrance of Allah and what has come down of the truth? And let them not be like those who were given the Scripture before, and a long period passed over them, so their hearts hardened; and many of them are defiantly disobedient.
5:13
فَ بِ مَا نَقْضِ هِم مِّيثَٰقَ هُمْ لَعَ نَّٰ هُمْ وَ جَعَلْ نَا قُلُوبَ هُمْ قَٰسِيَةً يُحَرِّفُ ونَ ٱلْ كَلِمَ عَن مَّوَاضِعِ هِۦ وَ نَسُ وا۟ حَظًّا مِّ مَّا ذُكِّرُ وا۟ بِ هِۦ وَ لَا تَزَالُ تَطَّلِعُ عَلَىٰ خَآئِنَةٍ مِّنْ هُمْ إِلَّا قَلِيلًا مِّنْ هُمْ فَ ٱعْفُ عَنْ هُمْ وَ ٱصْفَحْ إِنَّ ٱللَّهَ يُحِبُّ ٱلْ مُحْسِنِينَ
So for their breaking of the covenant We cursed them and made their hearts hard. They distort words from their [proper] usages and have forgotten a portion of that of which they were reminded. And you will still observe deceit among them, except a few of them. But pardon them and overlook [their misdeeds]. Indeed, Allah loves the doers of good.
6:43
فَ لَوْلَآ إِذْ جَآءَ هُم بَأْسُ نَا تَضَرَّعُ وا۟ وَ لَٰكِن قَسَتْ قُلُوبُ هُمْ وَ زَيَّنَ لَ هُمُ ٱل شَّيْطَٰنُ مَا كَانُ وا۟ يَعْمَلُ ونَ
Then why, when Our punishment came to them, did they not humble themselves? But their hearts became hardened, and Satan made attractive to them that which they were doing.