The Prophet ﷺ delivered the Khutba after offering the prayer on the Day of Nahr and said, "Whoever offers the prayer like us and slaughters like us then his Nusuk (sacrifice) will be accepted by Allah. And whoever slaughters his sacrifice before the ʿId prayer then he has not done the sacrifice." Abi Burda bin Niyar, the uncle of Al-Bara' said, "O Messenger of Allah ﷺ! I have slaughtered my sheep before the ʿId prayer and I thought today as a day of eating and drinking (not alcoholic drinks), and I liked that my sheep should be the first to be slaughtered in my house. So slaughtered my sheep and took my food before coming for the prayer." The Prophet ﷺ said, "The sheep which you have slaughtered is just mutton (not a Nusuk)." He (Abu Burda) said, "O Messenger of Allah ﷺ! I have a young she-goat which is dearer to me than two sheep. Will that be sufficient as a Nusuk on my behalf? "The Prophet ﷺ said, "Yes, it will be sufficient for you but it will not be sufficient (as a Nusuk) for anyone else after you." (Using translation from Bukhārī 955)   

خَطَبَنَا رَسُولُ اللهِ ﷺ يَوْمَ الْأَضْحَى بَعْدَ الصَّلَاةِ فَقَالَ مَنْ صَلَّى صَلَاتَنَا وَنَسَكَ نُسُكَنَا فَقَدْ أَصَابَ النُّسُكَ وَمَنْ نَسَكَ قَبْلَ الصَّلَاةِ فَشَاتُهُ شَاةُ لَحْمٍ وَلَا نُسُكَ لَهُ فَقَالَ أَبُو بُرْدَةَ بْنُ نِيَارٍ خَالُ الْبَرَاءِ يَا رَسُولَ اللهِ فَإِنِّي نَسَكْتُ شَاتِي قَبْلَ الصَّلَاةِ وَعَرَفْتُ أَنَّ الْيَوْمَ يَوْمُ أَكْلٍ وَشُرْبٍ وَأَحْبَبْتُ أَنْ تَكُونَ شَاتِي أَوَّلَ شَيْءٍ يُذْبَحُ فِي بَيْتِي فَذَبَحْتُ شَاتِي وَتَغَدَّيْتُ قَبْلَ أَنْ آتِيَ الصَّلَاةَ قَالَ شَاتُكَ شَاةُ لَحْمٍ فَقَالَ يَا رَسُولَ اللهِ فَإِنَّ عِنْدَنَا عَنَاقًا لَنَا جَذَعَةً هِيَ أَحَبُّ إِلَيَّ مِنْ شَاتَيْنِ أَفَتَجْزِي عَنِّي؟ قَالَ نَعَمْ وَلَنْ تَجْزِيَ عَنْ أَحَدٍ بَعْدِكَ