Sahih al-Bukhari 6273
Sahih al-Bukhari · Book 79: Asking Permission · Whoever sat in a relining posture
Narrated Abu Bakra:
حَدَّثَنَا عَلِيُّ بْنُ عَبْدِ اللَّهِ ، حَدَّثَنَا بِشْرُ بْنُ الْمُفَضَّلِ ، حَدَّثَنَا الْجُرَيْرِيُّ ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ أَبِي بَكْرَةَ ، عَنْ أَبِيهِ ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " أَلاَ أُخْبِرُكُمْ بِأَكْبَرِ الْكَبَائِرِ ". قَالُوا بَلَى يَا رَسُولَ اللَّهِ. قَالَ " الإِشْرَاكُ بِاللَّهِ، وَعُقُوقُ الْوَالِدَيْنِ " .
Allah's Messenger (ﷺ) said, "Shall I inform you of the biggest of the great sins?" They said, "Yes, O Allah's Apostle!" He said, "To join partners in worship with Allah, and to be undutiful to one's parents. "