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حَدَّثَنَا يُوسُفُ بْنُ عِيسَى، قَالَ: حَدَّثَنَا وَكِيعٌ، قَالَ: حَدَّثَنَا الرَّبِيعُ بْنُ صَبِيحٍ، عَنْ يَزِيدَ بْنِ أَبَانَ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ: كَانَ رَسُولُ اللهِ صلى الله عليه وسلم يُكْثِرُ الْقِنَاعَ، كَأَنَّ ثَوْبَهُ ثَوْبُ زَيَّاتٍ.
Hazrat Anas bin Malik radiyallahu anhu says, "Rasoollullah sallallahu alaihe wasallam often wore a cloth on his auspicious head. This cloth, because of its greasiness, looked as if had been oiled.
English reference:
Book 19, Hadith 119
Arabic reference:
Book 20, Hadith 126