It wasnarrated from Ibn Buraidah, from his father, that an-Najashisent apair of pure black Khuff as a gift to the Prophet (ﷺ) of,which hewore. (RU)
English reference (RU): Vol. 4, Book 32, Hadith 3620 (RU)
Arabic reference (RU): Book 32, Hadith 3751 (RU)