Hadith 6273
Narrated Abu Bakra: Allah's Apostle 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. "
Hadith 6274
حَدَّثَنَا
مُسَدَّدٌ ، حَدَّثَنَا
بِشْرٌ ، مِثْلَهُ ، وَكَانَ مُتَّكِئًا فَجَلَسَ ، فَقَالَ : " أَلَا وَقَوْلُ الزُّورِ " ، فَمَا زَالَ يُكَرِّرُهَا حَتَّى قُلْنَا : لَيْتَهُ سَكَتَ .
Narrated Bishr: as above (No. 290) adding: The Prophet was reclining (leaning) and then he sat up saying, "And I warn you against giving a false statement." And he kept on saying that warning so much so that we said, "Would that he had stopped."