Qataadah Radiyallahu 'Anhu narrates that Allah gave to every Nabi that He had sent a beautiful feature and beautiful voice. Your Nabi Sallallahu 'Alayhi Wasallam also had a beautiful feature and a beautiful voice. Rasulullah Sallallhu 'Alayhi Wasallam did not recite in a melodious tone as singers do. (IT)
English reference (IT): Book 43, Hadith 303 (IT)
Arabic reference (IT): Book 44, Hadith 320 (IT)