Oneness, Uniqueness of Allah (Tawheed)
Bukhari :: Book 9 :: Volume 93 :: Hadith 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."