Amrah narrates from Sayyidah Aishah (may Allah be pleased with her) that they said: "O Messenger of Allah, you forbade eating the meat of sacrifices after three days." The Messenger of Allah (peace and blessings be upon him) said: "I forbade you only because of the group of needy people who had arrived at the time of the sacrifice." He said: "So eat, give in charity and store (it)."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 10237