مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2593
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
Ibn 'Abbas (رضي الله عنه) said: I gave the Messenger of Allah (ﷺ) some Zamzam water, and he drank whilst standing.
Musnad Ahmad 2608Its isnad is saheeh]