Narrated 'Abdullah bin 'Amr:

The Prophet ﷺ said, "Al-Kaba'ir (the biggest sins) are: To join others (as partners) in worship with Allah, to be undutiful to one's parents," or said, "to take a false oath." (The sub-narrator, Shu'ba is not sure) Mu'adh said: Shu'ba said, "Al-kaba'ir (the biggest sins) are: (1) Joining others as partners in worship with Allah, (2) to take a false oath (3) and to be undutiful to one's parents," or said, "to murder (someone unlawfully).

حَدَّثَنِي مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ، حَدَّثَنَا شُعْبَةُ، عَنْ فِرَاسٍ، عَنِ الشَّعْبِيِّ، عَنْ عَبْدِ اللَّهِ بْنِ عَمْرٍو، عَنِ النَّبِيِّ ﷺ قَالَ " الْكَبَائِرُ الإِشْرَاكُ بِاللَّهِ، وَعُقُوقُ الْوَالِدَيْنِ ". أَوْ قَالَ " الْيَمِينُ الْغَمُوسُ ". شَكَّ شُعْبَةُ. وَقَالَ مُعَاذٌ حَدَّثَنَا شُعْبَةُ قَالَ " الْكَبَائِرُ الإِشْرَاكُ بِاللَّهِ، وَالْيَمِينُ الْغَمُوسُ، وَعُقُوقُ الْوَالِدَيْنِ ". أَوْ قَالَ " وَقَتْلُ النَّفْسِ ".