Sahih al-Bukhari 2662
صحيح البخاري#2662Sahihحَدَّثَنَا مُحَمَّدُ بْنُ سَلَامٍ أَخْبَرَنَا عَبْدُ الْوَهَّابِ حَدَّثَنَا خَالِدٌ الْحَذَّاءُ عَنْ عَبْدِ الرَّحْمَنِ بْنِ أَبِي بَكْرَةَ عَنْ أَبِيهِ قَالَ أَثْنَى رَجُلٌ عَلَى رَجُلٍ عِنْدَ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقَالَ وَيْلَكَ قَطَعْتَ عُنُقَ صَاحِبِكَ قَطَعْتَ عُنُقَ صَاحِبِكَ مِرَارًا ثُمَّ قَالَ مَنْ كَانَ مِنْكُمْ مَادِحًا أَخَاهُ لَا مَحَالَةَ فَلْيَقُلْ أَحْسِبُ فُلَانًا وَاللَّهُ حَسِيبُهُ وَلَا أُزَكِّي عَلَى اللَّهِ أَحَدًا أَحْسِبُهُ كَذَا وَكَذَا إِنْ كَانَ يَعْلَمُ ذَلِكَ مِنْهُ
Narrated Abu Bakra:A man praised another man in front of the Prophet (ﷺ) . The Prophet (ﷺ) said to him, "Woe to you, you have cut off your companion's neck, you have cut off your companion's neck," repeating it several times and then added, "Whoever amongst you has to praise his brother should say, 'I think that he is so and so, and Allah knows exactly the truth, and I do not confirm anybody's good conduct before Allah, but I think him so and so,' if he really knows what he says about him
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 52:26