The Book on Government
33/8. Chapter:
The obligation of obeying leaders in matters that do not involve sin, but it is forbidden to obey them in sinful matters
Sahih Muslim
وَحَدَّثَنَاهُ ابْنُ بَشَّارٍ، حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ، وَعَبْدُ الرَّحْمَنِ بْنُ مَهْدِيٍّ، عَنْ شُعْبَةَ، بِهَذَا الإِسْنَادِ وَقَالَ عَبْدًا حَبَشِيًّا .
This hadith has been transmitted on the authority of Shu'ba with the same chain of transmitters, and he said: "An Abyssinian slave."
Reference : Sahih Muslim 1838bIn-book reference : Book 33, Hadith 57USC-MSA web (English) reference : Book 20, Hadith 4529