Key Verses

1. 5:31Al-Maidah
   فَبَعَثَ ٱللَّهُ غُرَابٗا يَبۡحَثُ فِي ٱلۡأَرۡضِ لِيُرِيَهُۥ كَيۡفَ يُوَٰرِي سَوۡءَةَ أَخِيهِۚ قَالَ يَٰوَيۡلَتَىٰٓ أَعَجَزۡتُ أَنۡ أَكُونَ مِثۡلَ هَٰذَا ٱلۡغُرَابِ فَأُوَٰرِيَ سَوۡءَةَ أَخِيۖ فَأَصۡبَحَ مِنَ ٱلنَّـٰدِمِينَ
   Then Allah sent a raven scratching up the ground, to show him how to hide his brother's naked corpse. He said: Woe unto me! Am I not able to be as this raven and so hide my brother's naked corpse? And he became repentant.
   In context

   Allah sent a crow to dig the earth in front of him to bury another dead crow and teach him how to cover his brother’s body. He then became regretful. Regret is the end result of those who commit sins.

2. 5:52Al-Maidah
   فَتَرَى ٱلَّذِينَ فِي قُلُوبِهِم مَّرَضٞ يُسَٰرِعُونَ فِيهِمۡ يَقُولُونَ نَخۡشَىٰٓ أَن تُصِيبَنَا دَآئِرَةٞۚ فَعَسَى ٱللَّهُ أَن يَأۡتِيَ بِٱلۡفَتۡحِ أَوۡ أَمۡرٖ مِّنۡ عِندِهِۦ فَيُصۡبِحُواْ عَلَىٰ مَآ أَسَرُّواْ فِيٓ أَنفُسِهِمۡ نَٰدِمِينَ
   And thou seest those in whose heart is a disease race toward them, saying: We fear lest a change of fortune befall us. And it may happen that Allah will vouchsafe (unto thee) the victory, or a commandment from His presence. Then will they repent them of their secret thoughts.
   In context

   You will see, O Messenger, those weak in faith rushing to become friends with the Jews and the Christians, saying, ‘We fear that these people will gain victory and when they come into power we will be harmed’. Perhaps Allah will give victory to the Messenger and the believers or bring something from Him that will crush the force of the Jews and their allies.

3. 10:54Yunus
   وَلَوۡ أَنَّ لِكُلِّ نَفۡسٖ ظَلَمَتۡ مَا فِي ٱلۡأَرۡضِ لَٱفۡتَدَتۡ بِهِۦۗ وَأَسَرُّواْ ٱلنَّدَامَةَ لَمَّا رَأَوُاْ ٱلۡعَذَابَۖ وَقُضِيَ بَيۡنَهُم بِٱلۡقِسۡطِ وَهُمۡ لَا يُظۡلَمُونَ
   And if each soul that doeth wrong had all that is in the earth it would seek to ransom itself therewith; and they will feel remorse within them, when they see the doom. But it hath been judged between them fairly and they are not wronged.
   In context

   If every person who associated partners with Allah possessed all the valuable wealth on earth, they would offer it as ransom from Allah’s punishment if they were given the opportunity to do so. The idolaters will conceal their regret for their disbelief when they see the punishment on the Day of Judgement.

4. 23:40Al-Muminun
   قَالَ عَمَّا قَلِيلٖ لَّيُصۡبِحُنَّ نَٰدِمِينَ
   He said: In a little while they surely will become repentant.
   In context

   Allah responded to him, saying, “Very soon, these people who have rejected the message you have brought to them will regret their rejection.”

5. 26:157Ash-Shuara
   فَعَقَرُوهَا فَأَصۡبَحُواْ نَٰدِمِينَ
   But they hamstrung her, and then were penitent.
   In context

   So they agreed upon cutting its legs, and the most wretched from them all did the act. Then they regretted the deed they had committed because of realising that the punishment was about to befall them inevitably. However, regret after seeing the punishment is of no benefit.

6. 34:33SabaCommand
   وَقَالَ ٱلَّذِينَ ٱسۡتُضۡعِفُواْ لِلَّذِينَ ٱسۡتَكۡبَرُواْ بَلۡ مَكۡرُ ٱلَّيۡلِ وَٱلنَّهَارِ إِذۡ تَأۡمُرُونَنَآ أَن نَّكۡفُرَ بِٱللَّهِ وَنَجۡعَلَ لَهُۥٓ أَندَادٗاۚ وَأَسَرُّواْ ٱلنَّدَامَةَ لَمَّا رَأَوُاْ ٱلۡعَذَابَۚ وَجَعَلۡنَا ٱلۡأَغۡلَٰلَ فِيٓ أَعۡنَاقِ ٱلَّذِينَ كَفَرُواْۖ هَلۡ يُجۡزَوۡنَ إِلَّا مَا كَانُواْ يَعۡمَلُونَ
   Those who were despised say unto those who were proud: Nay but (it was your) scheming night and day, when ye commanded us to disbelieve in Allah and set up rivals unto Him. And they are filled with remorse when they behold the doom; and We place carcans on the necks of those who disbelieved. Are they requited aught save what they used to do?
   In context

   The followers who were oppressed by their leaders will say to their leaders who were arrogant to the truth: “But your scheming about us night and day stopped us from guidance, when you would order us to disbelieve in Allah and to worship creations besides Him”.

7. 49:6Al-Hujurat
   يَـٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوٓاْ إِن جَآءَكُمۡ فَاسِقُۢ بِنَبَإٖ فَتَبَيَّنُوٓاْ أَن تُصِيبُواْ قَوۡمَۢا بِجَهَٰلَةٖ فَتُصۡبِحُواْ عَلَىٰ مَا فَعَلۡتُمۡ نَٰدِمِينَ
   O ye who believe! If an evil-liver bring you tidings, verify it, lest ye smite some folk in ignorance and afterward repent of what ye did.
   In context

   O those who have faith in Allah and act upon whatever He legislates! If a wrongdoer brings some news about a group of people to you, then verify the truth of that news and do not hasten towards accepting it, in fear that if you accept it without verifying it, you could harm a group of people ignorantly.