Sahih al-Bukhari 6274
Sahih al-Bukhari · Book 79: Asking Permission · Whoever sat in a relining posture
Narrated Bishr:
حَدَّثَنَا مُسَدَّدٌ ، حَدَّثَنَا بِشْرٌ ، مِثْلَهُ، وَكَانَ مُتَّكِئًا فَجَلَسَ فَقَالَ " أَلاَ وَقَوْلُ الزُّورِ ". فَمَا زَالَ يُكَرِّرُهَا حَتَّى قُلْنَا لَيْتَهُ سَكَتَ .
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."