Sahih Muslim: Qiyamah Come

Book 41, Number 6956:

Abu Huraira reported Allah's Messenger (may peace be upon him) as saying: The Last Hour would not come unless you fight with people whose faces are like hammered shields and the Last Hour would not come until you would fight against those wearing the shoes of hair. 

Tafseer Ibnu Kathir: The Devil's Inspiration

Allah said,

[وَإِنَّ الشَّيَـطِينَ لَيُوحُونَ إِلَى أَوْلِيَآئِهِمْ لِيُجَـدِلُوكُمْ]

(And certainly, the Shayatin do inspire their friends to dispute with you,) Ibn Abi Hatim recorded that Abu Ishaq said that a man said to Ibn `Umar that Al-Mukhtar claimed that he received revelation. So Ibn `Umar said, "He has said the truth,'' and recited this Ayah,

[وَإِنَّ الشَّيَـطِينَ لَيُوحُونَ إِلَى أَوْلِيَآئِهِمْ]

(And certainly, the Shayatin do inspire their friends...)