Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: On the day of Arafah, milk was brought to the Messenger of Allah (peace and blessings be upon him); he (peace and blessings be upon him) drank it and gave the person on his right to drink as well.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11260