مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3474
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that Ibn ‘Abbas (رضي الله عنه) said: I gave the Prophet (ﷺ) some Zamzam to drink, and he drank whilst standing.
Musnad Ahmad 3497Its isnad is saheeh, al-Bukhari (1637) and Muslim (2027)]