Full Sharh — Sahih Muslim 4762
وَحَدَّثَنِي سَلَمَةُ بْنُ شَبِيبٍ، حَدَّثَنَا الْحَسَنُ بْنُ أَعْيَنَ، حَدَّثَنَا مَعْقِلٌ، عَنْ زَيْدِ بْنِ أَبِي، أُنَيْسَةَ عَنْ يَحْيَى بْنِ حُصَيْنٍ، عَنْ جَدَّتِهِ أُمِّ الْحُصَيْنِ، قَالَ سَمِعْتُهَا تَقُولُ، حَجَجْتُ مَعَ رَسُولِ اللَّهِ صلى الله عليه وسلم حَجَّةَ الْوَدَاعِ - قَالَتْ - فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم قَوْلاً كَثِيرًا ثُمَّ سَمِعْتُهُ يَقُولُ " إِنْ أُمِّرَ عَلَيْكُمْ عَبْدٌ مُجَدَّعٌ - حَسِبْتُهَا قَالَتْ - أَسْوَدُ يَقُودُكُمْ بِكِتَابِ اللَّهِ فَاسْمَعُوا لَهُ وَأَطِيعُوا " .
English Translation
It has been narrated on the authority of Yahya b. Husain who learnt the tradition from his grandmother. Umm Husain. He said':I heard her say: I performed Hajjat-ul-Wada' in the company of the Messenger of Allah (ﷺ). He said a lot of things (on this occasion). Then I heard him say: If a maimed slave is appointed a commander over you the narrator says: I think she said:" a black stave" who leads you according to the Book of Allah, then listen to him and obey him
Source
Sahih Muslim(صحيح مسلم)
The Book on Government
Hadith Number
4762