And his soul permitted to him the murder of his brother, so he killed him and became among the losers.
The Saheeh International Quran Translation
فَطَوَّعَتْ لَهُۥ نَفْسُهُۥ قَتْلَ أَخِيهِ فَقَتَلَهُۥ فَأَصْبَحَ مِنَ ٱلْخَٰسِرِينَAnd his soul permitted to him the murder of his brother, so he killed him and became among the losers.