Sahih al-Bukhari 1544
صحيح البخاري#1544Sahihحَدَّثَنَا عَبْدُ اللَّهِ بْنُ مُحَمَّدٍ، حَدَّثَنَا وَهْبُ بْنُ جَرِيرٍ، حَدَّثَنَا أَبِي، عَنْ يُونُسَ الأَيْلِيِّ، عَنِ الزُّهْرِيِّ، عَنْ عُبَيْدِ اللَّهِ بْنِ عَبْدِ اللَّهِ، عَنِ ابْنِ عَبَّاسٍ ـ رضى الله عنهما ـ أَنَّ أُسَامَةَ ـ رضى الله عنه ـ كَانَ رِدْفَ النَّبِيِّ صلى الله عليه وسلم مِنْ عَرَفَةَ إِلَى الْمُزْدَلِفَةِ، ثُمَّ أَرْدَفَ الْفَضْلَ مِنَ الْمُزْدَلِفَةِ إِلَى مِنًى. قَالَ فَكِلاَهُمَا قَالَ لَمْ يَزَلِ النَّبِيُّ صلى الله عليه وسلم يُلَبِّي، حَتَّى رَمَى جَمْرَةَ الْعَقَبَةِ.
Narrated 'Ubaidullah bin `Abdullah:Ibn `Abbas' said, "Usama rode behind Allah's Messenger (ﷺ) from `Arafat to Al-Muzdalifa; and then Al-Fadl rode behind Allah's Messenger (ﷺ) from Al-Muzdalifa to Mina." Ibn `Abbas added, "Both of them said, 'The Prophet kept on reciting Talbiya till he did the Rami of Jamrat-Al-`Aqaba
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: 25:30