حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا يَحْيَى، عَنْ شُعْبَةَ، عَنْ أَبِي التَّيَّاحِ، عَنْ أَنَسِ بْنِ مَالِكٍ ـ رضى الله عنه ـ قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم اسْمَعُوا وَأَطِيعُوا وَإِنِ اسْتُعْمِلَ عَلَيْكُمْ عَبْدٌ حَبَشِيٌّ كَأَنَّ رَأْسَهُ زَبِيبَةٌ "
Narrated Anas bin Malik:
Allah's Messenger (ﷺ) said, "You should listen to and obey, your ruler even if he was an Ethiopian (black) slave whose head looks like a raisin."
Reference: Sahih al-Bukhari 7142
In-book : Book 93, Hadith 6
USC-MSA web (English) : Vol. 9, Book 89, Hadith 256 (deprecated)