Sura al-Māʾidah 5:30

فَطَوَّعَتْ لَهُۥ نَفْسُهُۥ قَتْلَ أَخِيهِ فَقَتَلَهُۥ فَأَصْبَحَ مِنَ ٱلْخَٰسِرِينَ

faṭawwaʿat lahu nafsuhu qatla akhīhi faqatalahu fa-aṣbaḥa mina l-khāsirīna

The (selfish) soul of the other led him to the murder of his brother: he murdered him, and became (himself) one of the lost ones.

Sura al-Māʾidah 5:31

فَبَعَثَ ٱللَّـهُ غُرَابًا يَبْحَثُ فِى ٱلْأَرْضِ لِيُرِيَهُۥ كَيْفَ يُوَٰرِى سَوْءَةَ أَخِيهِ قَالَ يَٰوَيْلَتَىٰٓ أَعَجَزْتُ أَنْ أَكُونَ مِثْلَ هَٰذَا ٱلْغُرَابِ فَأُوَٰرِىَ سَوْءَةَ أَخِى فَأَصْبَحَ مِنَ ٱلنَّٰدِمِينَ

fa-baʿatha allāhu ghurāban yabḥathu fī l-arḍi li-yuriyahu kayfa yuwārī sawata akhīhi qalā yāwaylata aʿajaztu an akūna mithla hādhā l-ghurābi fa-uwāriya sawata akhī fa-aṣbaḥa mina l-nādimīna

Then Allah sent a raven, who scratched the ground, to show him how to hide the shame of his brother. "Woe is me!" said he; "Was I not even able to be as this raven, and to hide the shame of my brother?" then he became full of regrets-