Abu Mas'ud al-Ainsari reported: A person came to the Messenger of Allah (ﷺ) and said: I keep away from the morning prayer on account of such and such (a man), because; he keeps us so long. I never saw God's Messenger (ﷺ) more angry when giving an exhortation than he was that day. He said: 0 people, some of you are scaring people away. So whoever of you leads the people in prayer he must be brief, for behind him are the weak, the aged, and the people who have (argent) business to attend.
Source: sunnah.com
Other translations
Arabic
وَحَدَّثَنَا يَحْيَى بْنُ يَحْيَى، أَخْبَرَنَا هُشَيْمٌ، عَنْ إِسْمَاعِيلَ بْنِ أَبِي خَالِدٍ، عَنْ قَيْسٍ، عَنْ أَبِي مَسْعُودٍ الأَنْصَارِيِّ، قَالَ جَاءَ رَجُلٌ إِلَى رَسُولِ اللَّهِ صلى الله عليه وسلم فَقَالَ إِنِّي لأَتَأَخَّرُ عَنْ صَلاَةِ الصُّبْحِ مِنْ أَجْلِ فُلاَنٍ مِمَّا يُطِيلُ بِنَا . فَمَا رَأَيْتُ النَّبِيَّ صلى الله عليه وسلم 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 " .
sunnah.com