Sahih Muslim
The Book Pertaining to the Excellent Qualities of the Holy Prophet (may Peace be upon them) and His Companions (Kitab Al-Fadail)
Book Number: 030 / Hadith Number: 5772
Al-Bara' reported that Allah's Messenger (may peace be upon him) had the most handsome face amongst men and he had the best disposition and he was neither very tall nor short-statured.