Sahih Muslim 1552
صحيح مسلم#1552Sahihوَحَدَّثَنَا عَمْرٌو النَّاقِدُ، حَدَّثَنَا الأَسْوَدُ بْنُ عَامِرٍ، أَخْبَرَنَا شُعْبَةُ، عَنْ قَتَادَةَ، عَنْ أَنَسِ بْنِ مَالِكٍ، أَنَّ النَّبِيَّ صلى الله عليه وسلم قَنَتَ شَهْرًا يَلْعَنُ رِعْلاً وَذَكْوَانَ وَعُصَيَّةَ عَصَوُا اللَّهَ وَرَسُولَهُ .
Anas b. Malik reported that the Messenger of Allah (ﷺ) observed Qunut for one month Invoking curse upon Ri'l, Dhakwan, 'Usayya. those who disobeyed Allah and His Messenger (ﷺ)
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:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 5:385