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