Language:
كتاب الاستئذان
79  
Asking Permission
(35)
Chapter: Whoever sat in a relining posture
(35)
باب مَنِ اتَّكَأَ بَيْنَ يَدَىْ أَصْحَابِهِ
Sahih al-Bukhari 6274

Narrated Bishr:

as above (No. 290) adding: The Prophet (ﷺ) 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."

حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا بِشْرٌ، مِثْلَهُ، وَكَانَ مُتَّكِئًا فَجَلَسَ فَقَالَ ‏ "‏ أَلاَ وَقَوْلُ الزُّورِ ‏"‏‏.‏ فَمَا زَالَ يُكَرِّرُهَا حَتَّى قُلْنَا لَيْتَهُ سَكَتَ‏.‏
Reference : Sahih al-Bukhari 6274
In-book reference : Book 79, Hadith 48
USC-MSA web (English) reference : Vol. 8, Book 74, Hadith 291
  (deprecated numbering scheme)