Sahih al-Bukhari 4940
Sahih al-Bukhari · Book 65: Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh)) · "You shall certainly travel from stage to stage (in this life and in the Hereafter)" (V.84:19)
Narrated Ibn `Abbas:
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.
(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.