heard Messenger of Allah ﷺs ﷺ saying, "If the prayer is started do not run for it but just walk for it calmly and pray whatever you get, and complete whatever is missed. "  

عَنِ النَّبِيِّ ﷺ وَحَدَّثَنَا أَبُو الْيَمَانِ قَالَ أَخْبَرَنَا شُعَيْبٌ عَنِ الزُّهْرِيِّ قَالَ أَخْبَرَنِي أَبُو سَلَمَةَ بْنُ عَبْدِ الرَّحْمَنِ أَنَّ أَبَا هُرَيْرَةَ قَالَ سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ إِذَا أُقِيمَتِ الصَّلاَةُ فَلاَ تَأْتُوهَا تَسْعَوْنَ وَأْتُوهَا تَمْشُونَ عَلَيْكُمُ السَّكِينَةُ فَمَا أَدْرَكْتُمْ فَصَلُّوا وَمَا فَاتَكُمْ فَأَتِمُّوا  

My father said, "While we were praying with the Prophet ﷺ he heard the noise of some people. After the prayer he said, 'What is the matter?' They replied 'We were hurrying for the prayer.' He said, 'Do not make haste for the prayer, and whenever you come for the prayer, you should come with calmness, and pray whatever you get (with the people) and complete the rest which you have missed."  

بَيْنَمَا نَحْنُ نُصَلِّي مَعَ النَّبِيِّ ﷺ إِذْ سَمِعَ جَلَبَةَ رِجَالٍ فَلَمَّا صَلَّى قَالَ مَا شَأْنُكُمْ قَالُوا اسْتَعْجَلْنَا إِلَى الصَّلاَةِ قَالَ فَلاَ تَفْعَلُوا إِذَا أَتَيْتُمُ الصَّلاَةَ فَعَلَيْكُمْ بِالسَّكِينَةِ فَمَا أَدْرَكْتُمْ فَصَلُّوا وَمَا فَاتَكُمْ فَأَتِمُّوا