Sahih al-Bukhari, Hadith 693 ⓘ
Narrated Anas: The Prophet said, "Listen and obey (your chief) even if an Ethiopian whose head is like a raisin were made your chief."
حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا يَحْيَى، حَدَّثَنَا شُعْبَةُ، قَالَ حَدَّثَنِي أَبُو التَّيَّاحِ، عَنْ أَنَسٍ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " اسْمَعُوا وَأَطِيعُوا، وَإِنِ اسْتُعْمِلَ حَبَشِيٌّ كَأَنَّ رَأْسَهُ زَبِيبَةٌ " .
also referenced under: Book 10, Hadith 88 (In-Book) & Volume 1, Book 11, Hadith 662 (USC-MSA)