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.‏