Ibn 'Umar reported Allah's Apostle (ﷺ) having said:None of you should eat the flesh of his sacrificial animal beyond three days

This hadith has been narrated on the authority of Ibn Umar through another chain of transmitters

Ibn 'Umar reported that Allah's Messenger (ﷺ) 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