23:40
قَالَ عَ مَّا قَلِيلٍ لَّ يُصْبِحُ نَّ نَٰدِمِينَ
[Allah] said, "After a little, they will surely become regretful."
26:157
فَ عَقَرُ و هَا فَ أَصْبَحُ وا۟ نَٰدِمِينَ
But they hamstrung her and so became regretful.
49:6
يَٰٓ أَيُّهَا ٱلَّذِينَ ءَامَنُ وٓا۟ إِن جَآءَ كُمْ فَاسِقٌۢ بِ نَبَإٍ فَ تَبَيَّنُ وٓا۟ أَن تُصِيبُ وا۟ قَوْمًۢا بِ جَهَٰلَةٍ فَ تُصْبِحُ وا۟ عَلَىٰ مَا فَعَلْ تُمْ نَٰدِمِينَ
O you who have believed, if there comes to you a disobedient one with information, investigate, lest you harm a people out of ignorance and become, over what you have done, regretful.
5:31
فَ بَعَثَ ٱللَّهُ غُرَابًا يَبْحَثُ فِى ٱلْ أَرْضِ لِ يُرِيَ هُۥ كَيْفَ يُوَٰرِى سَوْءَةَ أَخِي هِ قَالَ يَٰ وَيْلَتَ ىٰٓ أَ عَجَزْ تُ أَنْ أَكُونَ مِثْلَ هَٰذَا ٱلْ غُرَابِ فَ أُوَٰرِىَ سَوْءَةَ أَخِ ى فَ أَصْبَحَ مِنَ ٱل نَّٰدِمِينَ
Then Allah sent a crow searching in the ground to show him how to hide the disgrace of his brother. He said, "O woe to me! Have I failed to be like this crow and hide the body of my brother?" And he became of the regretful.
5:52
فَ تَرَى ٱلَّذِينَ فِى قُلُوبِ هِم مَّرَضٌ يُسَٰرِعُ ونَ فِي هِمْ يَقُولُ ونَ نَخْشَىٰٓ أَن تُصِيبَ نَا دَآئِرَةٌ فَ عَسَى ٱللَّهُ أَن يَأْتِىَ بِ ٱلْ فَتْحِ أَوْ أَمْرٍ مِّنْ عِندِ هِۦ فَ يُصْبِحُ وا۟ عَلَىٰ مَآ أَسَرُّ وا۟ فِىٓ أَنفُسِ هِمْ نَٰدِمِينَ
So you see those in whose hearts is disease hastening into [association with] them, saying, "We are afraid a misfortune may strike us." But perhaps Allah will bring conquest or a decision from Him, and they will become, over what they have been concealing within themselves, regretful.