Narrated Abu Huraira : Allah's Apostle said, "Allah never listens to anything as He listens to the Prophet reciting Quran in a pleasant sweet sounding voice." A companion of Abu Huraira said, "He means, reciting the Quran aloud."
— Sahih Bukhari, Volume 9, Book 93: Oneness, Uniqueness of Allah (Tawheed), Hadith #574