Abu Bakrah reported: We were with the Messenger of Allah, peace and blessings be upon him, and he said, “Shall I not tell you about the worst enormities? They are three: idolatry against Allah, disobedience to parents, and false witness.” The Messenger of Allah was reclining and then he sat up and he kept repeating it until we wished he would stop.

Source: Sahih Bukhari 2511, Sahih Muslim 87

Grade: Muttafaqun Alayhi (authenticity agreed upon) according to Al-Bukhari and Muslim

عَنْ عَبْدِ الرَّحْمَنِ بْنِ أَبِي بَكْرَةَ عَنْ أَبِيهِ رَضِيَ اللَّهُ عَنْهُ قَالَ كُنَّا عِنْدَ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقَالَ أَلَا أُنَبِّئُكُمْ بِأَكْبَرِ الْكَبَائِرِ ثَلَاثًا الْإِشْرَاكُ بِاللَّهِ وَعُقُوقُ الْوَالِدَيْنِ وَشَهَادَةُ الزُّورِ أَوْ قَوْلُ الزُّورِ وَكَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مُتَّكِئًا فَجَلَسَ فَمَا زَالَ يُكَرِّرُهَا حَتَّى قُلْنَا لَيْتَهُ سَكَتَ

2511 صحيح البخاري كتاب الشهادات باب ما قيل في شهادة الزور

87 صحيح مسلم كِتَاب الْإِيمَانِ باب بَيَانِ الْكَبَائِرِ وَأَكْبَرِهَا