Sahih Muslim 1046
صحيح مسلم#1046Sahihوَحَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا الْمُغِيرَةُ، - وَهُوَ ابْنُ عَبْدِ الرَّحْمَنِ الْحِزَامِيُّ - عَنْ أَبِي الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ النَّبِيَّ صلى الله عليه وسلم قَالَ " إِذَا أَمَّ أَحَدُكُمُ النَّاسَ فَلْيُخَفِّفْ فَإِنَّ فِيهِمُ الصَّغِيرَ وَالْكَبِيرَ وَالضَّعِيفَ وَالْمَرِيضَ فَإِذَا صَلَّى وَحْدَهُ فَلْيُصَلِّ كَيْفَ شَاءَ " .
Abu Huraira reported:The Apostle of Allah (ﷺ) said: When any one of you leads the people in prayer, he should be brief for among them are the young and the aged, the weak and the sick. But when one of you prays by himself, he may (prolong) as he likes
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: 4:208