Sahih Bukhari Volume 1, Book 10, Hadith 702

حَدَّثَنَا أَحْمَدُ بْنُ يُونُسَ، قَالَ حَدَّثَنَا زُهَيْرٌ، قَالَ حَدَّثَنَا إِسْمَاعِيلُ، قَالَ سَمِعْتُ قَيْسًا، قَالَ أَخْبَرَنِي أَبُو مَسْعُودٍ، أَنَّ رَجُلاً، قَالَ وَاللَّهِ يَا رَسُولَ اللَّهِ إِنِّي لأَتَأَخَّرُ عَنْ صَلاَةِ الْغَدَاةِ مِنْ أَجْلِ فُلاَنٍ مِمَّا يُطِيلُ بِنَا‏.‏ فَمَا رَأَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم فِي مَوْعِظَةٍ أَشَدَّ غَضَبًا مِنْهُ يَوْمَئِذٍ ثُمَّ قَالَ ‏"‏ إِنَّ مِنْكُمْ مُنَفِّرِينَ، فَأَيُّكُمْ مَا صَلَّى بِالنَّاسِ فَلْيَتَجَوَّزْ، فَإِنَّ فِيهِمُ الضَّعِيفَ وَالْكَبِيرَ وَذَا الْحَاجَةِ ‏"‏‏

Narrated By Abu Mas'ud : A man came and said, "O Allah's Apostle! By Allah, I keep away from the morning prayer only because So and so prolongs the prayer when he leads us in it." The narrator said, "I never saw Allah's Apostle more furious in giving advice than he was at that time. He then said, "Some of you make people dislike good deeds (the prayer). So whoever among you leads the people in prayer should shorten it because among them are the weak, the old and the needy."