821. hadíth
وَقَالَ اَلنَّبِيُّ صَلَّى اَللَّهُ عَلَيْهِ وَ آلِهِ: «اَلْفَرْقُ بَيْنَ اَلْمُسْلِمِينَ وَ اَلْمُشْرِكِينَ اَلتَّلَحِّي بِالْعَمَائِمِ.
The Prophet, said: "The distinction between the Muslims and the polytheists is the wearing of turbans."