وَحَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، وَابْنُ، بَشَّارٍ - وَاللَّفْظُ لاِبْنِ الْمُثَنَّى - قَالاَ حَدَّثَنَا مُحَمَّدُ، بْنُ جَعْفَرٍ حَدَّثَنَا شُعْبَةُ، عَنْ زُبَيْدٍ الإِيَامِيِّ، عَنِ الشَّعْبِيِّ، عَنِ الْبَرَاءِ بْنِ عَازِبٍ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ إِنَّ أَوَّلَ مَا نَبْدَأُ بِهِ فِي يَوْمِنَا هَذَا نُصَلِّي ثُمَّ نَرْجِعُ فَنَنْحَرُ فَمَنْ فَعَلَ ذَلِكَ فَقَدْ أَصَابَ سُنَّتَنَا وَمَنْ ذَبَحَ فَإِنَّمَا هُوَ لَحْمٌ قَدَّمَهُ لأَهْلِهِ لَيْسَ مِنَ النُّسُكِ فِي شَىْءٍ ‏"‏ ‏.‏ وَكَانَ أَبُو بُرْدَةَ بْنُ نِيَارٍ قَدْ ذَبَحَ فَقَالَ عِنْدِي جَذَعَةٌ خَيْرٌ مِنْ مُسِنَّةٍ فَقَالَ ‏"‏ اذْبَحْهَا وَلَنْ تَجْزِيَ عَنْ أَحَدٍ بَعْدَكَ ‏"‏ ‏.‏

Al-Bara' b. 'Azib reported Allah's Messenger (PBUH) having said: The first (act) with which we started our day (the day of 'Id-ul Adha) was that we offered prayer. We then returned and sacrificed the animals and he who did that in fact adhered to our Sunnah (practice). And he who slaughtered the (animal on that day before the 'Id prayer), for him (the slaughtering of animal was directed to the acquiring of) meat for his family, and there is nothing of the sort of sacrifice in it. It was Abu Burda b. Niyar who had slaughtered (the animal before the 'Id prayer). He said: I have a small lamb, of less than one year, but better than that of more than a year. Thereupon Allah's Messenger (PBUH) qaid: Sacrifice it, but it will not suffice (as a sacrifice) for anyone after you. Translation Not Available

Book reference: Sahih Muslim Book 35 Hadith 4827
Web reference: Sahih Muslim Book 22 Hadith 1961 e