(18) بَاب لَا تَقُومُ السَّاعَةُ حَتَّى يَمُرَّ الرَّجُلُ بِقَبْرِ الرَّجُلِ فَيَتَمَنَّى أَنْ يَكُونَ مَكَانَ الْمَيِّتِ مِنْ الْبَلَاءِ
Abu Huraira reported Allah's Messenger (ﷺ) as saying:
The Last Hour would not come unless you fight with people whose faces are like hammered shields and the Last Hour would not come until you would fight against those wearing the shoes of hair.
Reference: Sahih Muslim 2912 a
In-book reference: Book 54, Hadith 76
USC-MSA web (English) reference(deprecated numbering scheme): Book 41, Hadith 6956