"Messenger of Allah turned (after praying) from a Salat in which he recited aloud and said: 'Has any one of you recite along with me just now?' A man said: 'Yes, O Messenger of Allah.' He said: 'Indeed I said to myself: Why was I being contended with for the Quran?'" He (Az-Zuhri one of the narrators) said: "So when they heard that from Messenger of Allah, the people stopped reciting with Messenger of Allah in the prayers that Messenger of Allah recited aloud."  

أَنَّ رَسُولَ اللَّهِ ﷺ انْصَرَفَ مِنْ صَلاَةٍ جَهَرَ فِيهَا بِالْقِرَاءَةِ فَقَالَ هَلْ قَرَأَ مَعِي أَحَدٌ مِنْكُمْ آنِفًا فَقَالَ رَجُلٌ نَعَمْ يَا رَسُولَ اللَّهِ قَالَ إِنِّي أَقُولُ مَا لِي أُنَازَعُ الْقُرْآنَ قَالَ فَانْتَهَى النَّاسُ عَنِ الْقِرَاءَةِ مَعَ رَسُولِ اللَّهِ ﷺ فِيمَا جَهَرَ فِيهِ رَسُولُ اللَّهِ ﷺ مِنَ الصَّلَوَاتِ بِالْقِرَاءَةِ حِينَ سَمِعُوا ذَلِكَ مِنْ رَسُولِ اللَّهِ ﷺ قَالَ وَفِي الْبَابِ عَنِ ابْنِ مَسْعُودٍ وَعِمْرَانَ بْنِ حُصَيْنٍ وَجَابِرِ بْنِ عَبْدِ اللَّهِ  

"Whoever prayed a Rak'ah in which he did not recite Umm Al-Qur'an, then he did not pray except if he was behind an Imam."