Ikrimah narrated: I saw Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) eating on the day of Arafah for a period of time, and he would say: "Neither the Messenger of Allah (peace and blessings be upon him) fasted that day, nor Abu Bakr (may Allah be pleased with him), nor Umar (may Allah be pleased with him)."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11599