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.  

جَاءَ رَجُلٌ إِلَى رَسُولِ اللَّهِ ﷺ فَقَالَ إِنِّي لأَتَأَخَّرُ عَنْ صَلاَةِ الصُّبْحِ مِنْ أَجْلِ فُلاَنٍ مِمَّا يُطِيلُ بِنَا فَمَا رَأَيْتُ النَّبِيَّ ﷺ 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  

This hadith like one narrated by Hashalm has been narrated from Isma'il with the same chain of transmitters.  

عَنْ إِسْمَاعِيلَ فِي هَذَا الإِسْنَادِ بِمِثْلِ حَدِيثِ هُشَيْمٍ  

The Apostle of Allah ﷺ said: When any one of you leads the people in prayer, he should be brief for among them are the young and the aged, the weak and the sick. But when one of you prays by himself, he may (prolong) as he likes.  

أَنَّ النَّبِيَّ ﷺ قَالَ إِذَا أَمَّ أَحَدُكُمُ النَّاسَ فَلْيُخَفِّفْ فَإِنَّ فِيهِمُ الصَّغِيرَ وَالْكَبِيرَ وَالضَّعِيفَ وَالْمَرِيضَ فَإِذَا صَلَّى وَحْدَهُ فَلْيُصَلِّ كَيْفَ شَاءَ  

This is what Abu Huraira transmitted to us from Muhammad the Messenger of Allah ﷺ, and he narrated (some) ahadith out of (these narrations and one of them is this): The Messenger of Allah ﷺ said: When any one of you stands to lead people In prayer, he should shorten it, for amongst them are the aged, and amongst them are the weak, but when he prays by himself, he may prolong his prayer as he likes.  

عَنْ مُحَمَّدٍ رَسُولِ اللَّهِ ﷺ فَذَكَرَ أَحَادِيثَ مِنْهَا وَقَالَ رَسُولُ اللَّهِ ﷺ إِذَا مَا قَامَ أَحَدُكُمْ لِلنَّاسِ فَلْيُخَفِّفِ الصَّلاَةَ فَإِنَّ فِيهِمُ الْكَبِيرَ وَفِيهِمُ الضَّعِيفَ وَإِذَا قَامَ وَحْدَهُ فَلْيُطِلْ صَلاَتَهُ مَا شَاءَ  

The Messenger of Allah ﷺ said: When any one of you leads people in prayer, he must shorten it for among them are the weak, the infirm and those who have business to attend.  

قَالَ رَسُولُ اللَّهِ ﷺ إِذَا صَلَّى أَحَدُكُمْ لِلنَّاسِ فَلْيُخَفِّفْ فَإِنَّ فِي النَّاسِ الضَّعِيفَ وَالسَّقِيمَ وَذَا الْحَاجَةِ  

Abu Bakr b. 'Abd al-Rahman reported that he had heard Abu Huraira say that the Messenger of Allah ﷺ said like it, but he substituted" the aged" for 'the infirm".  

قَالَ رَسُولُ اللَّهِ ﷺ بِمِثْلِهِ غَيْرَ أَنَّهُ قَالَ بَدَلَ السَّقِيمِ الْكَبِيرَ  

The Apostle of Allah ﷺ said to him: Lead your people in prayer. I said: Messenger of Allah. I perceive something (disturbing) in my soul. He (the Holy Prophet) asked me to draw near him and making me sit down in front of him he placed his hand on my breast between my nipples. and then, telling me to turn round, he placed it on my back between my shoulders. He then said: Act as an Imam for your people. He who acts as Imam of the people, he must be brief, for among them are the aged, among them are the sick, among them are the weak, and among them are the people who have business to attend. But when any of you prays alone, he may pray as he likes.  

أَنَّ النَّبِيَّ ﷺ قَالَ لَهُ أُمَّ قَوْمَكَ قَالَ قُلْتُ يَا رَسُولَ اللَّهِ إِنِّي أَجِدُ فِي نَفْسِي شَيْئًا قَالَ ادْنُهْ فَجَلَّسَنِي بَيْنَ يَدَيْهِ ثُمَّ وَضَعَ كَفَّهُ فِي صَدْرِي بَيْنَ ثَدْيَىَّ ثُمَّ قَالَ تَحَوَّلْ فَوَضَعَهَا فِي ظَهْرِي بَيْنَ كَتِفَىَّ ثُمَّ قَالَ أُمَّ قَوْمَكَ فَمَنْ أَمَّ قَوْمًا فَلْيُخَفِّفْ فَإِنَّ فِيهِمُ الْكَبِيرَ وَإِنَّ فِيهِمُ الْمَرِيضَ وَإِنَّ فِيهِمُ الضَّعِيفَ وَإِنَّ فِيهِمْ ذَا الْحَاجَةِ وَإِذَا صَلَّى أَحَدُكُمْ وَحْدَهُ فَلْيُصَلِّ كَيْفَ شَاءَ  

The last thing which the Messenger of Allah ﷺ instructed me was: When you lead the people in prayer, be brief.  

آخِرُ مَا عَهِدَ إِلَىَّ رَسُولُ اللَّهِ ﷺ إِذَا أَمَمْتَ قَوْمًا فَأَخِفَّ بِهِمُ الصَّلاَةَ  

The Apostle of Allah ﷺ used to be brief and perfect in prayer.  

أَنَّ النَّبِيَّ ﷺ كَانَ يُوجِزُ فِي الصَّلاَةِ وَيُتِمُّ  

The Messenger of Allah ﷺ was among those whose prayers was brief and perfect.  

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ مِنْ أَخَفِّ النَّاسِ صَلاَةً فِي تَمَامٍ  

I never prayed behind an Imam who was more brief and more perfect in prayer than the Messenger of Allah ﷺ.  

أَنَّهُ قَالَ مَا صَلَّيْتُ وَرَاءَ إِمَامٍ قَطُّ أَخَفَّ صَلاَةً وَلاَ أَتَمَّ صَلاَةً مِنْ رَسُولِ اللَّهِ ﷺ  

The Messenger of Allah ﷺ would listen to the crying of a lad in the company of his mother, in prayer, and he would recite a short surah or a small surah.  

أَنَسٌ كَانَ رَسُولُ اللَّهِ ﷺ يَسْمَعُ بُكَاءَ الصَّبِيِّ مَعَ أُمِّهِ وَهُوَ فِي الصَّلاَةِ فَيَقْرَأُ بِالسُّورَةِ الْخَفِيفَةِ أَوْ بِالسُّورَةِ الْقَصِيرَةِ  

When I begin the prayer I Intend to make it long, but I hear a boy cry. ing; I then shorten it because of his mother's feelings.  

قَالَ رَسُولُ اللَّهِ ﷺ إِنِّي لأَدْخُلُ الصَّلاَةَ أُرِيدُ إِطَالَتَهَا فَأَسْمَعُ بُكَاءَ الصَّبِيِّ فَأُخَفِّفُ مِنْ شِدَّةِ وَجْدِ أُمِّهِ بِهِ