[Machine] A man from the companions of the Prophet ﷺ said, "The Messenger of Allah ﷺ said, 'You may recite behind the Imam while the Imam is reciting.' They said, 'We do that.' He said, 'Do not do so, except for one of you reciting Umm al-Kitab (Surah Al-Fatiha) or the opening of the Book.'"  

عَنْ رَجُلٍ مِنْ أَصْحَابِ النَّبِيِّ ﷺ قَالَ قَالَ رَسُولُ اللهِ ﷺ لَعَلَّكُمْ تَقْرَءُونَ خَلْفَ الْإِمَامِ وَالْإِمَامُ يَقْرَأُ قَالُوا إِنَّا لَنَفْعَلُ ذَلِكَ قَالَ فَلَا تَفْعَلُوا إِلَّا أَنْ يَقْرَأَ أَحَدُكُمْ بِأُمِّ الْكِتَابِ أَوْ قَالَ فَاتِحَةِ الْكِتَابِ