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 . .