Sahih Muslim 1555
صحيح مسلم#1555Sahihحَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، وَابْنُ، بَشَّارٍ قَالاَ حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ، حَدَّثَنَا شُعْبَةُ، عَنْ عَمْرِو بْنِ مُرَّةَ، قَالَ سَمِعْتُ ابْنَ أَبِي لَيْلَى، قَالَ حَدَّثَنَا الْبَرَاءُ بْنُ عَازِبٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ يَقْنُتُ فِي الصُّبْحِ وَالْمَغْرِبِ .
Al-Bari' b. 'Azib reported that the Messenger of Allah (ﷺ) observed Qunut in the morning 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: 5:388