(82) باب الْحَمَائِلِ وَتَعْلِيقِ السَّيْفِ بِالْعُنُقِ
Narrated Anas:
The 'Prophet was the best and the bravest amongst the people. Once the people of Medina got terrified at night, so they went in the direction of the noise (that terrified them). The Prophet (ﷺ) met them (on his way back) after he had found out the truth. He was riding an unsaddled horse belonging to Abu Talha and a sword was hanging by his neck, and he was saying, "Don't be afraid! Don't be afraid!" He further said, "I found it (i.e. the horse) very fast," or said, "This horse is very fast." (Qastala-ni)
Reference: Sahih al-Bukhari 2908
In-book reference: Book 56, Hadith 121
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 4, Book 52, Hadith 156