(5) باب فَضْلِ الأَذَانِ وَثَوَابِ الْمُؤَذِّنِينَ
It was narrated that Ibn 'Abbas said:
"The Messenger of Allah said: 'Let the best of you give the call to prayer (Adhan), and let those who are most versed in the Qur'an lead you in prayer.'"
Reference: Sunan Ibn Majah 726
In-book reference: Book 3, Hadith 21
English translation: Vol. 1, Book 3, Hadith 726