The Prophet ﷺ said: One who recites the Qur'an in a loud voice is like one who gives alms openly; and one who recites the Qur'an quietly is one who gives alms secretly. (Using translation from Abū Dāʾūd 1333)  

أَنَّ رَسُولَ اللهِ ﷺ قَالَ «الْجَاهِرُ بِالْقُرْآنِ كَالْجَاهِرِ بِالصَّدَقَةِ وَالْمُسِرُّ بِالْقُرْآنِ كَالْمُسِرِّ بِالصَّدَقَةِ»