OBEY ANYONE WHO IS IN AUTHORITY OVER YOU H 671 "Hear and obey even if an Abyssinian slave whose head is like a raisin is placed in authority over you." R 671 Bukhari with a chain up to Anas related that the Prophet, praise and peace be upon him, said this.
665- وعن أنسٍ رضي الله عنه ، قَالَ : قَالَ رسولُ الله صلى الله عليه وآله وسلم : "اسْمَعُوا وأطِيعُوا ، وَإنِ استُعْمِلَ عَلَيْكُمْ عَبْدٌ حَبَشيٌّ ، كأنَّ رأْسَهُ زَبيبةٌ" رواه البخاري .