Mukhtasar Bukhari (Abridged) 413 — On slaves, freedmen, and minors

Sayyiduna Anas (may Allah be pleased with him) narrates from the Noble Prophet (peace and blessings be upon him) that he (peace be upon him) said: "Listen! Obey! Even if an Abyssinian (Ethiopian) is appointed as your ruler, whose head is like a dried raisin."