Sahih Muslim
The Book of Sacrifices (Kitab Al-Adahi)
Book Number: 022 / Hadith Number: 4855
Ibn 'Umar reported that Allah's Messenger (may peace be upon him) forbade that the flesh of sacrificial animals be eaten beyond three (days) Salim (son of Ibn Umar) said: Ibn 'Umar did not eat the flesh of the sacrificial animals beyond three (days). Ibn Abu 'Umar said:" Beyond three days."