مُسْنَدُ أَحْمَدَ
Musnad Ahmad 1837
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated from Ibn "Abbas that the Messenger of Allah (ﷺ) drank from Zamzam whilst standing.
Musnad Ahmad 1838Sahih (Darussalam) [ al-Bukhari (1635) and Muslim (2027)]