كتاب الفتن وأشراط الساعة
54  
The Book of Tribulations and Portents of the Last Hour
(8)
Chapter: The Hour Will Not Begin Until The Euphrates Uncovers A Mountain Of Gold
(8)
باب لاَ تَقُومُ السَّاعَةُ حَتَّى يَحْسِرَ الْفُرَاتُ عَنْ جَبَلٍ مِنْ ذَهَبٍ
Sahih Muslim 2894 b

This hadith has been narrated on the authority of Suhail with the same chain of transmitters but with this addition:

" My father said: If you see that, do not even go near it."
وَحَدَّثَنِي أُمَيَّةُ بْنُ بِسْطَامَ، حَدَّثَنَا يَزِيدُ بْنُ زُرَيْعٍ، حَدَّثَنَا رَوْحٌ، عَنْ سُهَيْلٍ، بِهَذَا الإِسْنَادِ نَحْوَهُ وَزَادَ فَقَالَ أَبِي إِنْ رَأَيْتَهُ فَلاَ تَقْرَبَنَّهُ ‏.‏
Reference : Sahih Muslim 2894b
In-book reference : Book 54, Hadith 39
USC-MSA web (English) reference : Book 41, Hadith 6919
  (deprecated numbering scheme)