Sahih al-Bukhari 5573
صحيح البخاري#5573Sahihقَالَ أَبُو عُبَيْدٍ ثُمَّ شَهِدْتُهُ مَعَ عَلِيِّ بْنِ أَبِي طَالِبٍ، فَصَلَّى قَبْلَ الْخُطْبَةِ، ثُمَّ خَطَبَ النَّاسَ فَقَالَ إِنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم نَهَاكُمْ أَنْ تَأْكُلُوا لُحُومَ نُسُكِكُمْ فَوْقَ ثَلاَثٍ. وَعَنْ مَعْمَرٍ عَنِ الزُّهْرِيِّ عَنْ أَبِي عُبَيْدٍ نَحْوَهُ.
Narrated Abu `Ubaid:(in continuation of above). Then I witnessed (the 'Its) with `Ali bin Abi Talib, and he too offered the `Id prayer before the sermon and then delivered the sermon before the people and said, "Allah's Messenger (ﷺ) has forbidden you to eat the meat of your sacrifices for more than three days
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 73:29