صَحِيحُ الْبُخَارِيِّ
Sahih al-Bukhari 693
Call to Prayers (Adhaan)
A slave or a manumitted slave can lead the Salat (prayer)
حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا يَحْيَى، حَدَّثَنَا شُعْبَةُ، قَالَ حَدَّثَنِي أَبُو التَّيَّاحِ، عَنْ أَنَسٍ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ اسْمَعُوا وَأَطِيعُوا، وَإِنِ اسْتُعْمِلَ حَبَشِيٌّ كَأَنَّ رَأْسَهُ زَبِيبَةٌ .
Narrated Anas: The Prophet (ﷺ) said, "Listen and obey (your chief) even if an Ethiopian whose head is like a raisin were made your chief."
Sahih al-Bukhari, 693Sahihصحيح