Sahih Muslim 1051
صحيح مسلم#1051Sahihحَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، وَابْنُ، بَشَّارٍ قَالاَ حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ، حَدَّثَنَا شُعْبَةُ، عَنْ عَمْرِو بْنِ مُرَّةَ، قَالَ سَمِعْتُ سَعِيدَ بْنَ الْمُسَيَّبِ، قَالَ حَدَّثَ عُثْمَانُ بْنُ أَبِي الْعَاصِ، قَالَ آخِرُ مَا عَهِدَ إِلَىَّ رَسُولُ اللَّهِ صلى الله عليه وسلم " إِذَا أَمَمْتَ قَوْمًا فَأَخِفَّ بِهِمُ الصَّلاَةَ " .
Uthman b. Abu'l-'As reported:The last thing which the Messenger of Allah (ﷺ) instructed me was: When you lead the people in prayer, be brief
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: 4:213