Kitab al-Fitan of Nu'aym ibn Hammad: ungraded, and weak overall. Never established on its own.
لا تقوم الساعة حتى تقاتلوا قوما ذلف الأنوف، صغار الأعين، كأن وجوههم المجان المطرقة
Narrated Abu Huraira:Allah's Messenger (ﷺ) said, "The Hour will not be established until you fight with the Turks; people with small eyes, red faces, and flat noses. Their faces will look like shields coated with leather. The Hour will not be established till you fight with people whose shoes are made of hair