“The Messenger of Allah ﷺ said: ‘Whoever performs a prayer in which he does not recite Ummul Qur’an (the Mother of the Qur’an, i.e., Al- Fatihah), it is deficient; not complete.’” I said: ‘O Abu Hurairah, sometimes I am behind the Imam. He pressed my forearm and said: ‘O Persian! Recite it to yourself.’” (Using translation from Ibn Mājah 838)
قَالَ رَسُولُ اللهِ ﷺ مَنْ صَلَّى صَلَاةً لَمْ يَقْرَأْ فِيهَا بِأُمِّ الْقُرْآنِ فَهِيَ خِدَاجٌ هِيَ خِدَاجٌ هِيَ خِدَاجٌ غَيْرُ تَمَامٍ فَقُلْتُ يَا أَبَا هُرَيْرَةَ إِنِّي أَكُونُ أَحْيَانًا وَرَاءَ الْإِمَامِ قَالَ فَغَمَزَ ذِرَاعِي وَقَالَ يَا فَارِسِيُّ اقْرَأْ بِهَا فِي نَفْسِكَ