Sahih Muslim 1556
صحيح مسلم#1556Sahihوَحَدَّثَنَا ابْنُ نُمَيْرٍ، حَدَّثَنَا أَبِي، حَدَّثَنَا سُفْيَانُ، عَنْ عَمْرِو بْنِ مُرَّةَ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ أَبِي لَيْلَى، عَنِ الْبَرَاءِ، قَالَ قَنَتَ رَسُولُ اللَّهِ صلى الله عليه وسلم فِي الْفَجْرِ وَالْمَغْرِبِ .
Al-Bari' reported that the Messenger of Allah (ﷺ) observed Qunut in the dawn and evening (prayers)
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: 5:389