Sayyiduna Nubayshah (may Allah be pleased with him) says: The Messenger of Allah (peace and blessings be upon him) said: "We had forbidden you from eating the meat of sacrifices beyond three days so that there would be enough for you all. Now Allah has brought abundance, so eat, store, and seek reward (by giving charity), for these days are days of eating, drinking and the remembrance of Allah."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19219