Sahih al-Bukhari 693
صحيح البخاري#693SahihNarrated Anas:The Prophet (ﷺ) said, "Listen and obey (your chief) even if an Ethiopian whose head is like a raisin were made your chief
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 10:88