Sahih al-Bukhari 4940
صحيح البخاري#4940Sahihحَدَّثَنَا سَعِيدُ بْنُ النَّضْرِ، أَخْبَرَنَا هُشَيْمٌ، أَخْبَرَنَا أَبُو بِشْرٍ، جَعْفَرُ بْنُ إِيَاسٍ عَنْ مُجَاهِدٍ، قَالَ قَالَ ابْنُ عَبَّاسٍ {لَتَرْكَبُنَّ طَبَقًا عَنْ طَبَقٍ} حَالاً بَعْدَ حَالٍ، قَالَ هَذَا نَبِيُّكُمْ صلى الله عليه وسلم.
Narrated Ibn `Abbas:(as regards the Verse):--'You shall surely travel from stage to stage (in this life and in the Hereafter).' (It means) from one state to another. That concerns your Prophet
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: 65:461