The Prophet ﷺ said thrice, "Should I inform you out the greatest of the great sins?" They said, "Yes, O Messenger of Allah ﷺ!" He said, "To join others in worship with Allah and to be undutiful to one's parents." The Prophet ﷺ then sat up after he had been reclining (on a pillow) and said, "And I warn you against giving a false witness, and he kept on saying that warning till we thought he would not stop. (See Hadith No. 7, Vol. 8)  

قَالَ النَّبِيُّ ﷺ أَلاَ أُنَبِّئُكُمْ بِأَكْبَرِ الْكَبَائِرِ ثَلاَثًا قَالُوا بَلَى يَا رَسُولَ اللَّهِ قَالَ الإِشْرَاكُ بِاللَّهِ وَعُقُوقُ الْوَالِدَيْنِ وَجَلَسَ وَكَانَ مُتَّكِئًا فَقَالَ أَلاَ وَقَوْلُ الزُّورِ قَالَ فَمَا زَالَ يُكَرِّرُهَا حَتَّى قُلْنَا لَيْتَهُ سَكَتَ  

Messenger of Allah ﷺ said thrice, "Shall I not inform you of the biggest of the great sins?" We said, "Yes, O Messenger of Allah ﷺ" He said, "To join partners in worship with Allah: to be undutiful to one's parents." The Prophet ﷺ sat up after he had been reclining and added, "And I warn you against giving forged statement and a false witness; I warn you against giving a forged statement and a false witness." The Prophet kept on saying that warning till we thought that he would not stop.  

قَالَ رَسُولُ اللَّهِ ﷺ أَلاَ أُنَبِّئُكُمْ بِأَكْبَرِ الْكَبَائِرِ قُلْنَا بَلَى يَا رَسُولَ اللَّهِ قَالَ الإِشْرَاكُ بِاللَّهِ وَعُقُوقُ الْوَالِدَيْنِ وَكَانَ مُتَّكِئًا فَجَلَسَ فَقَالَ أَلاَ وَقَوْلُ الزُّورِ وَشَهَادَةُ الزُّورِ أَلاَ وَقَوْلُ الزُّورِ وَشَهَادَةُ الزُّورِ فَمَا زَالَ يَقُولُهَا حَتَّى قُلْتُ لاَ يَسْكُتُ  

Messenger of Allah 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. "  

قَالَ رَسُولُ اللَّهِ ﷺ أَلاَ أُخْبِرُكُمْ بِأَكْبَرِ الْكَبَائِرِ قَالُوا بَلَى يَا رَسُولَ اللَّهِ قَالَ الإِشْرَاكُ بِاللَّهِ وَعُقُوقُ الْوَالِدَيْنِ