Musnad Ahmad 31:271

'Ammar ibn Muhammad, the nephew of Sufyan al-Thawri, narrated to us, from al-A'mash, from Abu Salih, from Abu Sa'id al-Khudri, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "The Hour will not be established until you fight a people with small eyes and broad faces, as if their eyes are the eyes of locusts, and as if their faces are hammered shields. They will wear shoes made of hair, and they will use leather shields, until they tie their horses to the palm trees."