The prohibition of eating sacrificial meat for more than three days, which applied at the beginning of Islam but was then abrogated, and now it is permissible to eat it as long as one wants.
وَحَدَّثَنَا ابْنُ أَبِي عُمَرَ، وَعَبْدُ بْنُ حُمَيْدٍ، قَالَ ابْنُ أَبِي عُمَرَ حَدَّثَنَا وَقَالَ عَبْدٌ، أَخْبَرَنَا عَبْدُ الرَّزَّاقِ، أَخْبَرَنَا مَعْمَرٌ، عَنِ الزُّهْرِيِّ، عَنْ سَالِمٍ، عَنِ ابْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم نَهَى أَنْ تُؤْكَلَ لُحُومُ الأَضَاحِي بَعْدَ ثَلاَثٍ . قَالَ سَالِمٌ فَكَانَ ابْنُ عُمَرَ لاَ يَأْكُلُ لُحُومَ الأَضَاحِيِّ فَوْقَ ثَلاَثٍ . وَقَالَ ابْنُ أَبِي عُمَرَ بَعْدَ ثَلاَثٍ .
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."