Hazrat Ibn Abbas radiyallahu anhuma reports, "Sayyidina Rasoolullah sallallahu alaihe wasallam was once delivering a sermon. He was wearing a black turban, or an oily strip of cloth. (JA)
English reference (JA): Book 16, Hadith 111 (JA)
Arabic reference (JA): Book 17, Hadith 118 (JA)