وَعَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ
قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «لَا تُبَادِرُوا الْإِمَامَ إِذَا كَبَّرَ فكبروا وَإِذا قَالَ: وَلَا الضَّالّين. فَقُولُوا: آمِينَ وَإِذَا رَكَعَ فَارْكَعُوا وَإِذَا قَالَ: سَمِعَ اللَّهُ لِمَنْ حَمِدَهُ فَقُولُوا: اللَّهُمَّ رَبَّنَا لَك الْحَمد «إِلَّا أَنَّ الْبُخَارِيَّ لَمْ يَذْكُرْ: «وَإِذَا قَالَ: وَلَا الضَّالّين»
Abu Hurayrah reported God’s Messenger as saying, “Do not try to go ahead of the imam. When he says ‘God is most great’ say ‘God is most great’; when he says ‘Nor of those who err’ (i.e. the end of sura 1) say ‘Amen’; when he bows bow; and when he says ‘God listens to him who praises Him’ say, ‘O God, our Lord, to Thee be the praise’.”
Mishkat al-Masabih 1077, Book 5, Prayer, Hadith 555. 1 min read