Sunan Ibn Majah 921
سنن ابن ماجه#921Da'ifحَدَّثَنَا هِشَامُ بْنُ عَمَّارٍ، حَدَّثَنَا إِسْمَاعِيلُ بْنُ عَيَّاشٍ، حَدَّثَنَا أَبُو بَكْرٍ الْهُذَلِيُّ، عَنْ قَتَادَةَ، عَنِ الْحَسَنِ، عَنْ سَمُرَةَ بْنِ جُنْدُبٍ، أَنَّ النَّبِيَّ ـ صلى الله عليه وسلم ـ قَالَ " إِذَا سَلَّمَ الإِمَامُ فَرُدُّوا عَلَيْهِ " .
It was narrated from Samurah bin Jundub that the Prophet (ﷺ) said:“When the Imam says the Salam, then respond to him.”
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:
Al-AlbaniDaif
Muhammad Fouad Abd al-BaqiDaif
Shuaib Al ArnautDaif
Zubair Ali ZaiDaif
In-book reference: 5:119