Sunan Abi Dawud 1001
سنن أبي داود#1001Da'ifحَدَّثَنَا مُحَمَّدُ بْنُ عُثْمَانَ أَبُو الْجَمَاهِرِ، حَدَّثَنَا سَعِيدُ بْنُ بَشِيرٍ، عَنْ قَتَادَةَ، عَنِ الْحَسَنِ، عَنْ سَمُرَةَ، قَالَ أَمَرَنَا النَّبِيُّ صلى الله عليه وسلم أَنْ نَرُدَّ عَلَى الإِمَامِ وَأَنْ نَتَحَابَّ وَأَنْ يُسَلِّمَ بَعْضُنَا عَلَى بَعْضٍ .
Narrated Samurah ibn Jundub: The Prophet (ﷺ) commanded us to respond to the salutation of the imam. and to love each other, and to salute each other
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 Muhyi Al-Din Abdul HamidDaif
Shuaib Al ArnautDaif
Zubair Ali ZaiDaif
In-book reference: 2:612