Abu Dawud Book 27, Hadith Number 4027.
Chapter : Wearing clothes made of silk and wool khazz.
Narated By Sa’d : I saw a man riding on a white mule and he had a black turban of silk and wool. He said: The Apostle of Allah (PBUH) put it on me. This is the version of ‘Uthman, and there is the word akhbara in his tradition.