Sahih al-Bukhari 5617
صحيح البخاري#5617SahihNarrated Ibn `Abbas:The Prophet (ﷺ) drank Zamzam (water) while standing
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 74:43