Abu Huraira reported: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
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
Uthman b. Abu'l-'As at-Thaqafi reported: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
Anas reported:I never prayed behind an Imam who was more brief and more perfect in prayer than the Messenger of Allah (ﷺ)
Hadiz 1055 — Sahih Muslim 4:217
وَحَدَّثَنَا يَحْيَى بْنُ يَحْيَى، أَخْبَرَنَا جَعْفَرُ بْنُ سُلَيْمَانَ، عَنْ ثَابِتٍ الْبُنَانِيِّ، عَنْ أَنَسٍ، قَالَ أَنَسٌ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يَسْمَعُ بُكَاءَ الصَّبِيِّ مَعَ أُمِّهِ وَهُوَ فِي الصَّلاَةِ فَيَقْرَأُ بِالسُّورَةِ الْخَفِيفَةِ أَوْ بِالسُّورَةِ الْقَصِيرَةِ .
Anas reported: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
Anas b. Malik reported the Messenger of Allah (ﷺ) having said: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
Al-Bara' b. 'Azib reported:I noticed the prayer of Muhammad (ﷺ) and saw his Qiyam (standing), his bowing, and then going back to the standing posture after bowing, his prostration, his sitting between the two prostrations, and his prostration and sitting between salutation and going away, all these were nearly equal to one another