Sahih Muslim Book - 4, Hadith - 1044

و حَدَّثَنَا يَحْيَى بْنُ يَحْيَى أَخْبَرَنَا هُشَيْمٌ عَنْ إِسْمَعِيلَ بْنِ أَبِي خَالِدٍ عَنْ قَيْسٍ عَنْ أَبِي مَسْعُودٍ الْأَنْصَارِيِّ قَالَ جَاءَ رَجُلٌ إِلَى رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقَالَ إِنِّي لَأَتَأَخَّرُ عَنْ صَلَاةِ الصُّبْحِ مِنْ أَجْلِ فُلَانٍ مِمَّا يُطِيلُ بِنَا فَمَا رَأَيْتُ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ غَضِبَ فِي مَوْعِظَةٍ قَطُّ أَشَدَّ مِمَّا غَضِبَ يَوْمَئِذٍ فَقَالَ يَا أَيُّهَا النَّاسُ إِنَّ مِنْكُمْ مُنَفِّرِينَ فَأَيُّكُمْ أَمَّ النَّاسَ فَلْيُوجِزْ فَإِنَّ مِنْ وَرَائِهِ الْكَبِيرَ وَالضَّعِيفَ وَذَا الْحَاجَةِ.

It was narrated that Abu Mas'ud Al-Ansari said: "A man came to the Messenger of Allah (s.a.w) and said: 'I keep away from Fajr prayer because of so-and-so, because he makes it too long for us.' I have never seen the Prophet (s.a.w) so angry in exhortation as he was that day. He said: 'O people, there are among you some who repel others. Whoever among you leads the people in prayer, let him be brief, for among them are the elderly, the weak and those with urgent needs."'