Sahih al-Bukhari 1678
صحيح البخاري#1678Sahihحَدَّثَنَا عَلِيٌّ، حَدَّثَنَا سُفْيَانُ، قَالَ أَخْبَرَنِي عُبَيْدُ اللَّهِ بْنُ أَبِي يَزِيدَ، سَمِعَ ابْنَ عَبَّاسٍ ـ رضى الله عنهما ـ يَقُولُ أَنَا مِمَّنْ، قَدَّمَ النَّبِيُّ صلى الله عليه وسلم لَيْلَةَ الْمُزْدَلِفَةِ فِي ضَعَفَةِ أَهْلِهِ.
Narrated Ibn `Abbas:I was among those whom the Prophet (ﷺ) sent on the night of Al-Muzdalifa early being among the weak members of his family
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: 25:158