Sunan Ibn Majah 720
سنن ابن ماجه#720Sahihحَدَّثَنَا أَبُو كُرَيْبٍ، وَأَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ قَالاَ حَدَّثَنَا زَيْدُ بْنُ الْحُبَابِ، عَنْ مَالِكِ بْنِ أَنَسٍ، عَنِ الزُّهْرِيِّ، عَنْ عَطَاءِ بْنِ يَزِيدَ اللَّيْثِيِّ، عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " إِذَا سَمِعْتُمُ النِّدَاءَ فَقُولُوا كَمَا يَقُولُ الْمُؤَذِّنُ " .
It was narrated that Abu Sa'eed Al-Khudri said:"The Messenger of Allah said: 'When you hear the call (to prayer), say what the Mu'adh-dhin says
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: 3:15