"Messenger of Allah prayed the Subh prayer, and he had difficulty with the recitation. When turned (after finishing) he said: 'I think that you are reciting behind your Imam?'" He said: "We said: 'Yes, Messenger of Allah, by Allah!' He said: 'Do not do that, except for Umm Al-Kitab, for there is no Salat for one who does not recite it.'" (Using translation from Tirmidhī 311)
صَلَّى بِنَا رَسُولُ اللهِ ﷺ صَلَاةَ الْغَدَاةِ فَثَقُلَتْ عَلَيْهِ الْقِرَاءَةُ فَلَمَّا انْصَرَفَ قَالَ إِنِّي لَأَرَاكُمْ تَقْرَءُونَ وَرَاءَ إِمَامِكُمْ قُلْنَا نَعَمْ وَاللهِ يَا رَسُولَ اللهِ إِنَّا لَنَفْعَلُ هَذَا قَالَ فَلَا تَفْعَلُوا إِلَّا بِأُمِّ الْقُرْآنِ؛ فَإِنَّهُ لَا صَلَاةَ لِمَنْ لَمْ يَقْرَأْ بِهَا