Sahih al-Bukhari, Hadith 3592 ⓘ
Narrated `Umar bin Taghlib: I heard Allah's Messenger saying, "Near the Hour you will fight with people who will wear hairy shoes; and you will also fight people with flat faces like shields."
حَدَّثَنَا سُلَيْمَانُ بْنُ حَرْبٍ، حَدَّثَنَا جَرِيرُ بْنُ حَازِمٍ، سَمِعْتُ الْحَسَنَ، يَقُولُ حَدَّثَنَا عَمْرُو بْنُ تَغْلِبَ، قَالَ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ " بَيْنَ يَدَىِ السَّاعَةِ تُقَاتِلُونَ قَوْمًا يَنْتَعِلُونَ الشَّعَرَ، وَتُقَاتِلُونَ قَوْمًا كَأَنَّ وُجُوهَهُمُ الْمَجَانُّ الْمُطْرَقَةُ " .
also referenced under: Book 61, Hadith 99 (In-Book) & Volume 4, Book 56, Hadith 790 (USC-MSA)