وعن ابن عباس رضى الله عنهما
قال: سقيت النبي صلى الله عليه وسلم: من زمزم، فشرب وهو قائم
I served the Messenger of Allah (sallallahu alayhi wa sallam) Zamzam water to drink and he drank it while he was standing.
Riyad as-Salihin 766, Book 3, The Book About the Etiquette of Eating, Hadith 40. 1 min read