Ash'ath bin Abd al-Malik (may Allah have mercy on him) narrates from al-Hasan (may Allah have mercy on him) that plucking dates at night, harvesting at night and sacrificing at night were forbidden, and that was only because of the hardship of people's circumstances: if a man did it at night, he was forbidden from it, and then permission was given for it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19202
Abu Ubayd (may Allah have mercy on him), the freed slave of Ibn Azhar, says: I was present at the Eid with Sayyiduna Ali bin Abi Talib (may Allah be pleased with him), and I heard him say: "None of you should eat from his sacrifice after three days."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19203
Abu Ubayd says: I was present at the Eid with Sayyiduna Ali bin Abi Talib (may Allah be pleased with him). He offered the prayer and then delivered the sermon, saying: "The Messenger of Allah (peace and blessings be upon him) forbade us from eating the meat of our sacrifices after three days."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19204
Abu Ubayd, the freed slave of Abd al-Rahman bin Awf, heard Ali (may Allah be pleased with him) say on the day of al-Adha: "O people! The Messenger of Allah (peace and blessings be upon him) has forbidden you from eating your sacrifices after three days, so do not eat them."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19205