Sahih Bukhari Volume 4, Book 52, Hadith Number 277.
Narated By Anas : Allah’s Apostle was the (most handsome), most generous and the bravest of all the people. Once the people of Medina got frightened having heard an uproar at night. So, the Prophet met the people while he was riding an unsaddled horse belonging to Abu Talha and carrying his sword (slung over his shoulder). He said (to them), “Don’t get scared, don’t get scared.” Then he added, “I found it (i.e the horse) very fast.”