Surah Al-Ma'idah Verse 30

فَطَوَّعَتْ لَهُ نَفْسُهُ قَتْلَ أَخِيهِ فَقَتَلَهُ فَأَصْبَحَ مِنَ الْخَاسِرِينَ

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