Sahih al-Bukhari 5615
صحيح البخاري#5615Sahihحَدَّثَنَا أَبُو نُعَيْمٍ، حَدَّثَنَا مِسْعَرٌ، عَنْ عَبْدِ الْمَلِكِ بْنِ مَيْسَرَةَ، عَنِ النَّزَّالِ، قَالَ أَتَى عَلِيٌّ ـ رضى الله عنه ـ عَلَى باب الرَّحَبَةِ، فَشَرِبَ قَائِمًا فَقَالَ إِنَّ نَاسًا يَكْرَهُ أَحَدُهُمْ أَنْ يَشْرَبَ وَهْوَ قَائِمٌ، وَإِنِّي رَأَيْتُ النَّبِيَّ صلى الله عليه وسلم فَعَلَ كَمَا رَأَيْتُمُونِي فَعَلْتُ.
Narrated An-Nazzal:Ali came to the gate of the courtyard (of the Mosque) and drank (water) while he was standing and said, "Some people dislike to drink while standing, but I saw the Prophet (ﷺ) doing (drinking water) as you have seen me doing now
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: 74:41