The Book of the Adhan (The Call to Prayer)
7/9. Chapter:
Two Mu'adhdhins In One Masjid
Sunan an-Nasai
أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا اللَّيْثُ، عَنِ ابْنِ شِهَابٍ، عَنْ سَالِمٍ، عَنْ أَبِيهِ، أَنَّ النَّبِيَّ صلى الله عليه وسلم قَالَ " إِنَّ بِلاَلاً يُؤَذِّنُ بِلَيْلٍ فَكُلُوا وَاشْرَبُوا حَتَّى تَسْمَعُوا تَأْذِينَ ابْنِ أُمِّ مَكْتُومٍ " .
It was narrated from Salim, from his father, that the Prophet (S.A.W) said: "Bilal calls the Adhan during the night, so eat and drink until you hear Ibn Umm Maktoom calling the Adhan."
Reference : Sunan an-Nasa'i 638In-book reference : Book 7, Hadith 13English translation : Vol. 1, Book 7, Hadith 639