Muwatta Imam Malik (Riwayat Ibn al-Qasim)

Abu Ubaid, the freed slave of Ibn Azhar, narrates: I was present with Sayyiduna Umar ibn al-Khattab (may Allah be pleased with him) on Eid. He came and led the prayer, then after finishing the prayer, he delivered a sermon to the people and then said: The Messenger of Allah (peace and blessings be upon him) forbade fasting on these two days of Eid: the day when you break your fasts, that is, Eid al-Fitr, and the other day when you eat from your sacrifices, that is, Eid al-Adha. Abu Ubaid said: Then I performed Eid with Sayyiduna Uthman (may Allah be pleased with him). He came and led the prayer, then after finishing, he delivered a sermon and said to the people: Today two Eids have come together for you, the Eid prayer and the day of Jumu'ah. Whoever among the people of the outlying villages wishes to wait for Jumu'ah may do so, and whoever wishes to return home may go; I have given him permission. Abu Ubaid said: Then I performed the prayer with Sayyiduna Ali ibn Abi Talib (may Allah be pleased with him) while Sayyiduna Uthman (may Allah be pleased with him) was under siege. He (Sayyiduna Ali, may Allah be pleased with him) came and led the prayer, then after finishing, he delivered a sermon.

And with the same chain of narration, it is narrated from (Sayyiduna Abu Hurairah, may Allah be pleased with him) that the Messenger of Allah, peace and blessings be upon him, forbade fasting on the two days of Eid al-Fitr and Eid al-Adha.