The Messenger of Allah ﷺ said, "The Hour will not come until the Muslims fight the Turks, a people whose faces are like hammered shields. They wear hair and walk on hair."
أخبرنا قتيبة قال حدثنا يعقوب عن سهيل عن أبيه
أن رسول الله ﷺ قال لا تقوم الساعة حتى يقاتل المسلمون الترك قوما وجوههم كالمجان المطرقة يلبسون الشعر ويمشون في الشعر
Muslim narrated it in "The Book of Tribulations," chapter, "The Hour will not come until a man passes by another man's grave..." etc., hadith no. 2912, from Qutayba, with the same wording. It is also found in Kubra, hadith no. 4386.