Yahya related to me from Malik from Ibn Shihab that Abu Ubayd,the mawla of Ibn Azhar said, "I was present at an id with Umar ibn al-Khattab. He prayed, and then after he had prayed he gave a khutba tothe people and said, 'The Messenger of Allah, may Allah bless him andgrant him peace, forbade fasting on these two days - the day you breakyour fast (after Ramadan), and the day you eat from your sacrifice(after Hajj) .' "Abu Ubaydcontinued,"Then I was present atan id with Uthman ibn Affan. He came and prayed, and when he hadfinished he gave a khutba and said, 'Two ids have been joined togetherfor you on this day of yours. If any of the people of al-Aliyya (thehills outlying Madina) want to wait for the jumua they can do so, andif any of them want to return, I have given them permission.' AbuUbayd continued, "Then I was present at an id with AIi ibn Abi Talib(at the time when Uthman was being detained). He came and prayed, andthen after he had prayed he gave a khutba."
USC-MSA web (English) reference: Book 10, Hadith 5
Arabic reference: Book 10, Hadith 435