[Machine] The Messenger of Allah ﷺ went out to the people while they were praying and their voices were raised with recitation. He said, "Verily, the one who is in prayer is having a confidential conversation with his Lord, so let each one of you see what he converses with his Lord in, and do not compete with one another in recitation of the Quran."  

أَنَّ رَسُولَ اللهِ ﷺ «خَرَجَ عَلَى النَّاسِ وَهُمْ يُصَلُّونَ وَقَدْ عَلَتْ أَصْوَاتُهُمْ بِالْقِرَاءَةِ» فَقَالَ «إِنَّ الْمُصَلِّيَ يُنَاجِي رَبَّهُ فَلْيَنْظُرْ مَاذَا يُنَاجِيهِ بِهِ وَلَا يَجْهَرُ بَعْضُكُمْ عَلَى بَعْضٍ فِي الْقُرْآنِ»  

The Messenger of Allah ﷺ retired to the mosque. He heard them (the people) reciting the Qur'an in a loud voice. He removed the curtain and said: Lo! every one of you is calling his Lord quietly. One should not trouble the other and one should not raise the voice in recitation or in prayer over the voice of the other. (Using translation from Abū Dāʾūd 1332)  

«اعْتَكَفَ رَسُولُ اللهِ ﷺ فِي الْمَسْجِدِ فَسَمِعَهُمْ يَجْهَرُونَ بِالْقِرَاءَةِ وَهُوَ فِي قُبَّةٍ فَكَشَفَ السُّتُورَ» وَقَالَ «أَلَا إِنَّ كُلَّكُمْ مُنَاجٍ رَبَّهُ فَلَا يُؤْذَيَنَّ بَعْضُكُمْ بَعْضًا وَلَا يَرْفَعَنَّ بَعْضُكُمْ عَلَى بَعْضٍ فِي الْقِرَاءَةِ» أَوْ قَالَ «فِي الصَّلَاةِ»