Language:
كتاب الجهاد والسير
56  
Fighting for the Cause of Allah (Jihaad)
(95)
Chapter: Fighting against the Turks
(95)
باب قِتَالِ التُّرْكِ
Sahih al-Bukhari 2927

Narrated `Amr bin Taghlib:

The Prophet (ﷺ) said, "One of the portents of the Hour is that you will fight with people wearing shoes made of hair; and one of the portents of the Hour is that you will fight with broad-faced people whose faces will look like shields coated with leather."

حَدَّثَنَا أَبُو النُّعْمَانِ، حَدَّثَنَا جَرِيرُ بْنُ حَازِمٍ، قَالَ سَمِعْتُ الْحَسَنَ، يَقُولُ حَدَّثَنَا عَمْرُو بْنُ تَغْلِبَ، قَالَ قَالَ النَّبِيُّ صلى الله عليه وسلم ‏ "‏ إِنَّ مِنْ أَشْرَاطِ السَّاعَةِ أَنْ تُقَاتِلُوا قَوْمًا يَنْتَعِلُونَ نِعَالَ الشَّعَرِ، وَإِنَّ مِنْ أَشْرَاطِ السَّاعَةِ أَنْ تُقَاتِلُوا قَوْمًا عِرَاضَ الْوُجُوهِ، كَأَنَّ وُجُوهَهُمُ الْمَجَانُّ الْمُطَرَّقَةُ ‏"‏‏.‏
Reference : Sahih al-Bukhari 2927
In-book reference : Book 56, Hadith 140
USC-MSA web (English) reference : Vol. 4, Book 52, Hadith 178
  (deprecated numbering scheme)