From Sahih Bukhari (Hadith 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
Reference: Bukhari 2927