Abu Ubaid (may Allah have mercy on him) says that on both occasions of Eid al-Fitr and Eid al-Adha, I had the opportunity to be with Sayyiduna Uthman (may Allah be pleased with him) and Sayyiduna Ali (may Allah be pleased with him). Both of them would first lead the prayer, and after finishing the prayer, they would advise the people. I heard both of them say that the Messenger of Allah (peace and blessings be upon him) forbade fasting on these two days. And I also heard Sayyiduna Ali (may Allah be pleased with him) say that the Prophet (peace and blessings be upon him) forbade eating the meat of the sacrifice after three days.