Surah Al-Ma'idah 5:30

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.

Translation: Saheeh International

Tafsir

Then his soul prompted him it seduced him to slay his brother so he slew him and became one of the losers by slaying him. And he did not know what to do with him because he was the first of the Children of Adam to die on earth and so he carried him on his back.

Excerpt from Tafsir al-Jalalayn, commentary on 5:30, via Quran.com. The reader has the full commentary and 9 more tafsirs.