(3) باب السُّنَّةِ فِي الأَذَانِ
It was narrated that 'Uthman bin Abul-As said:
"The last instruction that the Messenger of Allah gave to me was that I should not appoint a Mu'adh-dhin who took payment for the Adhan." (sahih) (ES)
Reference (ES): Sunan Ibn Majah 714 (ES)
In-book reference (ES): Book 3, Hadith 9 (ES)
English translation (ES): Vol. 1, Book 3, Hadith 714 (ES)