Sahih al-Bukhari 7547
Sahih al-Bukhari · Book 97: Oneness, Uniqueness of Allah (Tawheed) · “A person who is perfect in reciting and memorizing the Qur'an will be with the honourable, pious and just scribes.”
Narrated Ibn `Abbas:
حَدَّثَنَا حَجَّاجُ بْنُ مِنْهَالٍ ، حَدَّثَنَا هُشَيْمٌ ، عَنْ أَبِي بِشْرٍ ، عَنْ سَعِيدِ بْنِ جُبَيْرٍ ، عَنِ ابْنِ عَبَّاسٍ ـ رضى الله عنهما ـ قَالَ كَانَ النَّبِيُّ صلى الله عليه وسلم مُتَوَارِيًا بِمَكَّةَ، وَكَانَ يَرْفَعُ صَوْتَهُ، فَإِذَا سَمِعَ الْمُشْرِكُونَ سَبُّوا الْقُرْآنَ وَمَنْ جَاءَ بِهِ، فَقَالَ اللَّهُ عَزَّ وَجَلَّ لِنَبِيِّهِ صلى الله عليه وسلم {وَلاَ تَجْهَرْ بِصَلاَتِكَ وَلاَ تُخَافِتْ بِهَا}
The Prophet (ﷺ) was hiding himself in Mecca and used to recite the (Qur'an) in a loud voice. When the pagans heard him they would abuse the Qur'an and the one who brought it, so Allah said to His Prophet: 'Neither say your prayer aloud, nor say it in a low tone.' (17.110)