I heard the Prophet ﷺ delivering a sermon, and he said (on the Day of ʿId-Allah. a), "The first thing we will do on this day of ours is that we will offer the ʿId prayer, then we will return and slaughter our sacrifices; and whoever does so, then indeed he has followed our tradition, and whoever slaughtered his sacrifice (before the prayer), what he offered was just meat that he presented to his family, and that was not a sacrifice." Abu Burda got up and said, "O Messenger of Allah ﷺ! I slaughtered the sacrifice before the prayer and I have got a Jadha'a which is better than an old sheep." The Prophet ﷺ said, "Slaughter it to make up for that, but it will not be sufficient for anybody else after you."  

سَمِعْتُ النَّبِيَّ ﷺ يَخْطُبُ فَقَالَ إِنَّ أَوَّلَ مَا نَبْدَأُ مِنْ يَوْمِنَا هَذَا أَنْ نُصَلِّيَ ثُمَّ نَرْجِعَ فَنَنْحَرَ فَمَنْ فَعَلَ هَذَا فَقَدْ أَصَابَ سُنَّتَنَا وَمَنْ نَحَرَ فَإِنَّمَا هُوَ لَحْمٌ يُقَدِّمُهُ لأَهْلِهِ لَيْسَ مِنَ النُّسُكِ فِي شَىْءٍ فَقَالَ أَبُو بُرْدَةَ يَا رَسُولَ اللَّهِ ذَبَحْتُ قَبْلَ أَنْ أُصَلِّيَ وَعِنْدِي جَذَعَةٌ خَيْرٌ مِنْ مُسِنَّةٍ فَقَالَ اجْعَلْهَا مَكَانَهَا وَلَنْ تَجْزِيَ أَوْ تُوفِيَ عَنْ أَحَدٍ بَعْدَكَ