(4) باب مَا يُقَالُ إِذَا أَذَّنَ الْمُؤَذِّنُ
It was narrated that Abu Hurairah said:
"The Messenger of Allah said: 'When the Mu'adh-dhin calls the Adhan, say as he says.'" (RU)
Reference (RU): Sunan Ibn Majah 718 (RU)
In-book reference (RU): Book 3, Hadith 13 (RU)
English translation (RU): Vol. 1, Book 3, Hadith 718 (RU)