The Messenger of Allah ﷺ said, "Listen and obey, even if an Ethiopian slave whose head looks like a raisin is appointed over you."
قال رسول الله ﷺ: اسمعوا وأطيعوا، وإن استعمل عليكم عبد حبشي كأن رأسه زبيبة.
Bukhari narrated it in the Book of Rulings (7142), from Musaddad, who said, Yahya bin Saeed related to us, from Shubah, from Abu Tayah, from Anas bin Malik, and he mentioned it.