Jami` at-Tirmidhi, Volume 6, Book 46, Hadith 3936 (DarusSalam) ⓘ
Narrated Abu Hurairah: that the Messenger of Allah said: "Leadership is among the Quraish, and reasoning and judgment is among the Ansar, and the Adhan is among the Ethiopians, and the trust is among the Al-Azd." meaning Yemen.
حَدَّثَنَا أَحْمَدُ بْنُ مَنِيعٍ، حَدَّثَنَا زَيْدُ بْنُ حُبَابٍ، حَدَّثَنَا مُعَاوِيَةُ بْنُ صَالِحٍ، حَدَّثَنَا أَبُو مَرْيَمَ الأَنْصَارِيُّ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " الْمُلْكُ فِي قُرَيْشٍ وَالْقَضَاءُ فِي الأَنْصَارِ وَالأَذَانُ فِي الْحَبَشَةِ وَالأَمَانَةُ فِي الأَزْدِ " . يَعْنِي الْيَمَنَ .
also referenced under: Hadith 3936 (Reference) & Book 49, Hadith 4315 (In-Book)