Sahih al-Bukhari 2953
صحيح البخاري#2953Sahihحَدَّثَنَا عَلِيُّ بْنُ عَبْدِ اللَّهِ، حَدَّثَنَا سُفْيَانُ، قَالَ حَدَّثَنِي الزُّهْرِيُّ، عَنْ عُبَيْدِ اللَّهِ، عَنِ ابْنِ عَبَّاسٍ ـ رضى الله عنهما ـ قَالَ خَرَجَ النَّبِيُّ صلى الله عليه وسلم فِي رَمَضَانَ، فَصَامَ حَتَّى بَلَغَ الْكَدِيدَ أَفْطَرَ. قَالَ سُفْيَانُ قَالَ الزُّهْرِيُّ أَخْبَرَنِي عُبَيْدُ اللَّهِ عَنِ ابْنِ عَبَّاسٍ. وَسَاقَ الْحَدِيثَ.
Narrated Ibn `Abbas:Once the Prophet (ﷺ) set out in the month of Ramadan. He observed fasting till he reached a place called Kadid where he broke his fast
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: 56:165