Language:
كتاب المناقب
61  
Virtues and Merits of the Prophet (pbuh) and his Companions
(25)
Chapter: The signs of Prophethood in Islam
(25)
باب عَلاَمَاتِ النُّبُوَّةِ فِي الإِسْلاَمِ
Sahih al-Bukhari 3599

Um Salama:

The Prophet (ﷺ) woke up and said, "Glorified be Allah: What great (how many) treasures have been sent down, and what great (how many ) afflictions have been sent down!"

وَعَنِ الزُّهْرِيِّ، حَدَّثَتْنِي هِنْدُ بِنْتُ الْحَارِثِ، أَنَّ أُمَّ سَلَمَةَ، قَالَتِ اسْتَيْقَظَ النَّبِيُّ صلى الله عليه وسلم فَقَالَ ‏ "‏ سُبْحَانَ اللَّهِ، مَاذَا أُنْزِلَ مِنَ الْخَزَائِنِ وَمَاذَا أُنْزِلَ مِنَ الْفِتَنِ ‏"‏‏.‏
Reference : Sahih al-Bukhari 3599
In-book reference : Book 61, Hadith 107
USC-MSA web (English) reference : Vol. 4, Book 56, Hadith 797
  (deprecated numbering scheme)