Riyad as-Salihin

Abu Sa'id 'Amr bin Huraith (May Allah be pleased with him) reported: It was as if I am seeing the Messenger of Allah (ﷺ) wearing a black turban and both ends of it are falling over his shoulders.

[Muslim].

Another narration is: The Messenger of Allah (ﷺ) was delivering a Khutbah wearing a black turban.