(5) باب بَيَانِ مَا كَانَ مِنَ النَّهْىِ عَنْ أَكْلِ لُحُومِ الأَضَاحِيِّ بَعْدَ ثَلاَثٍ فِي أَوَّلِ الإِسْلاَمِ وَبَيَانِ نَسْخِهِ وَإِبَاحَتِهِ إِلَى مَتَى شَاءَ
Ibn 'Umar reported Allah's Apostle (ﷺ) having said:
None of you should eat the flesh of his sacrificial animal beyond three days.
Reference: Sahih Muslim 1970 a
In-book reference: Book 35, Hadith 37
USC-MSA web (English) reference(deprecated numbering scheme): Book 22, Hadith 4853