كتاب الإمامة
10  
The Book of Leading the Prayer (Al-Imamah)
(35)
Chapter: The Imam should make the prayer short
(35)
باب مَا عَلَى الإِمَامِ مِنَ التَّخْفِيفِ
Sunan an-Nasa'i 823
It was narrated from Abu Hurairah that the Prophet (ﷺ)said:
"When any one of you leads the people in prayer, let him make it short, for among them are the sick, the weak and the elderly. And when any one of you prays by himself, let him make it as long as he wishes."
أَخْبَرَنَا قُتَيْبَةُ، عَنْ مَالِكٍ، عَنْ أَبِي الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏ "‏ إِذَا صَلَّى أَحَدُكُمْ بِالنَّاسِ فَلْيُخَفِّفْ فَإِنَّ فِيهِمُ السَّقِيمَ وَالضَّعِيفَ وَالْكَبِيرَ فَإِذَا صَلَّى أَحَدُكُمْ لِنَفْسِهِ فَلْيُطَوِّلْ مَا شَاءَ ‏"‏ ‏.‏
Grade: Sahih (Darussalam)
Reference : Sunan an-Nasa'i 823
In-book reference : Book 10, Hadith 47
English translation : Vol. 1, Book 10, Hadith 824