Amr bin Taghlib (may Allah be pleased with him) says that the Messenger of Allah (peace and blessings be upon him) said: "Before the Hour you will fight a people whose shoes are of hair, and you will wage jihad against people with broad faces, as though their faces were shields layered one upon another."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 18596