كتاب الفتن وأشراط الساعة
54  
The Book of Tribulations and Portents of the Last Hour
(18)
Chapter: The Hour Will Not Begin Until A Man Passes By Another Man's Grave And Wishes That He Was In The Place Of The Deceased, Because Of Calamity
(18)
بَاب لَا تَقُومُ السَّاعَةُ حَتَّى يَمُرَّ الرَّجُلُ بِقَبْرِ الرَّجُلِ فَيَتَمَنَّى أَنْ يَكُونَ مَكَانَ الْمَيِّتِ مِنْ الْبَلَاءِ
Sahih Muslim 2919 b

Jabir b. Samura reported:

I heard Allah's Messenger (ﷺ) as saying: There would lie open for a group of Muslims, or for a group of believers, the treasures of the family of Kisra which would be in the white (palace). In a version of Qutaiba there is definitely the word "Muslim".
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، وَأَبُو كَامِلٍ الْجَحْدَرِيُّ قَالاَ حَدَّثَنَا أَبُو عَوَانَةَ، عَنْ سِمَاكِ، بْنِ حَرْبٍ عَنْ جَابِرِ بْنِ سَمُرَةَ، قَالَ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ ‏ "‏ لَتَفْتَحَنَّ عِصَابَةٌ مِنَ الْمُسْلِمِينَ أَوْ مِنَ الْمُؤْمِنِينَ كَنْزَ آلِ كِسْرَى الَّذِي فِي الأَبْيَضِ ‏"‏ ‏.‏ قَالَ قُتَيْبَةُ مِنَ الْمُسْلِمِينَ ‏.‏ وَلَمْ يَشُكَّ ‏.‏
Reference : Sahih Muslim 2919b
In-book reference : Book 54, Hadith 95
USC-MSA web (English) reference : Book 41, Hadith 6977
  (deprecated numbering scheme)