(117) باب السُّرْعَةِ وَالرَّكْضِ فِي الْفَزَعِ
Narrated Anas bin Malik:
Once the people got frightened, so Allah's Messenger (ﷺ) rode a slow horse belonging to Abu Talha, and he set out all alone, making the horse gallop. Then the people rode, making their horses gallop after him. On his return he said, "Don't be afraid (there is nothing to be afraid of) (and I have found) this horse a very fast one." That horse was never excelled in running hence forward. (Qastalani Vol. 5)
Reference: Sahih al-Bukhari 2969
In-book reference: Book 56, Hadith 178
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 4, Book 52, Hadith 213