Sa'id bin Jubayr سعيد بن جبير الأسدي · Chapters on Dress

“The Messenger of Allah (ﷺ) commanded that use should be made of the skins of dead animals, if they were tanned.”

It was narrated from Ibn Buraidah, from his father, that an-Najashi sent a pair of pure black Khuff as a gift to the Prophet (ﷺ) of, which he wore.