Shama-il Tirmidhi Chapter 19, Hadith Number 1 (119).
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.” Commentary.That means that the cloth was oily due to…