Sahih Bukhari
Oneness, Uniqueness of Allah (Tawheed)
Volume: 009 / Book Number: 093 / Hadith Number: 574
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."