Sahih al Bukhari 2927
Fighting for the Cause of Allah (Jihaad)
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 ".
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
Text from the public-domain hadith-api dataset. Numbering follows that dataset and can differ by a few from some printed editions — check the wording, not only the number.