فَطَوَّعَتْ لَهُۥ نَفْسُهُۥ قَتْلَ أَخِيهِ فَقَتَلَهُۥ فَأَصْبَحَ مِنَ ٱلْخَـٰسِرِينَ

And his soul permitted to him the murder of his brother, so he killed him and became among the losers.

— Al-Mā’idah 5:30