(52) بَابُ قَوْلِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «الْمَاهِرُ بِالْقُرْآنِ مَعَ الْكِرَامِ الْبَرَرَةِ»
Narrated Ibn `Abbas:
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)
Reference: Sahih al-Bukhari 7547
In-book reference: Book 97, Hadith 172
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 9, Book 93, Hadith 637