Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: The Messenger of Allah (peace and blessings be upon him) did not fast on the day of Arafah, and Umm al-Fadl (may Allah be pleased with her) sent him (peace and blessings be upon him) milk as a gift, and he (peace and blessings be upon him) drank it at Arafah.
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 21477