Ibn 'Abbas (May Allah be pleased with them) reported:
I served the Messenger of Allah (ﷺ) Zamzam water to drink and he drank it while he was standing. <b>[Al-Bukhari and Muslim]</b>.
وعن ابن عباس رضى الله عنهما قال: سقيت النبي صلى الله عليه وسلم من زمزم، فشرب وهو قائم .((متفق عليه))