Sahih al-Bukhari, Hadith 6274 ⓘ
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."
حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا بِشْرٌ، مِثْلَهُ، وَكَانَ مُتَّكِئًا فَجَلَسَ فَقَالَ " أَلاَ وَقَوْلُ الزُّورِ " . فَمَا زَالَ يُكَرِّرُهَا حَتَّى قُلْنَا لَيْتَهُ سَكَتَ.
also referenced under: Book 79, Hadith 48 (In-Book) & Volume 8, Book 74, Hadith 291 (USC-MSA)