Volume 9 · Book 93 · Hadith 618
Narrated Abu Salama: Abu Huraira said, "Allah's Apostle said, 'Whoever does not recite Qur'an in a nice voice is not from us,' and others said extra," (that means) to recite it aloud."
— Sahih Bukhari, Volume 9, Book 93: Oneness, Uniqueness of Allah (Tawheed), Hadith #618