Ibn Buraydah narrates from his father (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "I had forbidden you from eating the meat of sacrifices beyond three days; by that I only intended that those who have means should be generous to those who have none. So now eat whatever you wish, and store."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19212