Narrated Anas bin Malik: Allah's Apostle said, "You should listen to and obey, your ruler even if he was an Ethiopian (black) slave whose head looks like a raisin."
Hadith ReferenceSahih Bukhari / The Book of Al-Ahkam (Judgements) / Hadith: 7142
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة