the Messenger of Allah forbade eating the meat of sacrificial animals after three days" (Sahih )

أَنَّ رَسُولَ اللَّهِ ﷺ نَهَى أَنْ تُؤْكَلَ لُحُومُ الأَضَاحِي بَعْدَ ثَلاَثٍ