فَبَعَثَ اللَّهُ غُرابًا يَبحَثُ فِي الأَرضِ لِيُرِيَهُ كَيفَ يُواري سَوءَةَ أَخيهِ ۚ قالَ يا وَيلَتا أَعَجَزتُ أَن أَكونَ مِثلَ هٰذَا الغُرابِ فَأُوارِيَ سَوءَةَ أَخي ۖ فَأَصبَحَ مِنَ النّادِمينَ
Muhammad Qadri
So his soul incited him to kill his brother - he therefore killed him, and was therefore ruined.