Sunan Ibn Majah 732
سنن ابن ماجه#732Sahihحَدَّثَنَا أَبُو بَدْرٍ، عَبَّادُ بْنُ الْوَلِيدِ حَدَّثَنِي مَعْمَرُ بْنُ مُحَمَّدِ بْنِ عُبَيْدِ اللَّهِ بْنِ أَبِي رَافِعٍ، مَوْلَى النَّبِيِّ ـ صلى الله عليه وسلم ـ حَدَّثَنِي أَبِي مُحَمَّدُ بْنُ عُبَيْدِ اللَّهِ عَنْ أَبِيهِ عُبَيْدِ اللَّهِ عَنْ أَبِي رَافِعٍ قَالَ رَأَيْتُ بِلاَلاً يُؤَذِّنُ بَيْنَ يَدَىْ رَسُولِ اللَّهِ ـ صلى الله عليه وسلم ـ مَثْنَى مَثْنَى وَيُقِيمُ وَاحِدَةً .
It was narrated that Abu Rafi' said:"I saw Bilal calling the Adhan in fron of Allah's Messenger, (saying the phrases) two by two, and saying each phrase once in the Iqamah
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 3:27