Language:
كتاب التفسير
65  
Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
(2)
"You shall certainly travel from stage to stage (in this life and in the Hereafter)" (V.84:19)
(2)
Sahih al-Bukhari 4940

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.

حَدَّثَنَا 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.‏
Reference : Sahih al-Bukhari 4940
In-book reference : Book 65, Hadith 461
USC-MSA web (English) reference : Vol. 6, Book 60, Hadith 464
  (deprecated numbering scheme)