Whoever leads people (in Prayer), let him make it short Sunan Ibn Majah 986
Arabic hadith text
حَدَّثَنَا مُحَمَّدُ بْنُ رُمْحٍ، أَنْبَأَنَا اللَّيْثُ بْنُ سَعْدٍ، عَنْ أَبِي الزُّبَيْرِ، عَنْ جَابِرٍ، قَالَ صَلَّى مُعَاذُ بْنُ جَبَلٍ الأَنْصَارِيُّ بِأَصْحَابِهِ صَلاَةَ الْعِشَاءِ فَطَوَّلَ عَلَيْهِمْ فَانْصَرَفَ رَجُلٌ مِنَّا فَصَلَّى فَأُخْبِرَ مُعَاذٌ عَنْهُ فَقَالَ إِنَّهُ مُنَافِقٌ . فَلَمَّا بَلَغَ ذَلِكَ الرَّجُلَ دَخَلَ عَلَى رَسُولِ اللَّهِ ـ صلى الله عليه وسلم ـ فَأَخْبَرَهُ مَا قَالَ لَهُ مُعَاذٌ فَقَالَ النَّبِيُّ ـ صلى الله عليه وسلم ـ " أَتُرِيدُ أَنْ تَكُونَ فَتَّانًا يَا مُعَاذُ إِذَا صَلَّيْتَ بِالنَّاسِ فَاقْرَأْ بِالشَّمْسِ وَضُحَاهَا وَسَبِّحِ اسْمَ رَبِّكَ الأَعْلَى وَاللَّيْلِ إِذَا يَغْشَى وَاقْرَأْ بِاسْمِ رَبِّكَ "
Translation
It wasnarrated that Jabir said
“Mu’adh bin Jabal Al-Ansari led hiscompanions in the ‘Isha’ prayer and he made it long. A man amonguswent away and prayed by himself. Mu’adh was told about that andhesaid: ‘He is a hypocrite.’ When the man heard about that, hewent tothe Messenger of Allah (ﷺ) and told him what Mu’adh hadsaid to him.The Prophet (ﷺ) said: ‘Do you want to be a cause ofFitnah (trial,tribulation), O Mu’adh? When you lead the people inprayer, recite “Bythe sun and its brightness,”[Ash-Shams 91] and“Glorify the Name ofyour Lord the Most High,” [Al-A’la 87] and“By the night as itenvelopes,” [Al-Lail 92] and “Recite in theName of yourLord.’”[Al-‘Alaq]