Riyad as-Saliheen 767
Ibn 'Abbas (May Allah be pleased with them) reported:
I served Messenger of Allah ﷺ Zamzam water to drink and he drank it while he was standing.
[Al-Bukhari and Muslim].
وعن ابن عباس رضى الله عنهما قال: سقيت النبي ﷺ من زمزم، فشرب وهو قائم . .
Classification
Sahih (Authentic)
References
Riyad as-Saliheen 767
Riyad as-Saliheen Book of Etiquette of Eating, Hadith 40