Sunan an-Nasa'i 2964
سنن النسائي#2964SahihIt was narrated from Ibn Abbas that:the Messenger of Allah drank from the water of Zamzam while standing
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih - Agreed Upon
In-book reference: 24:347