From Sahih Bukhari (Hadith 6212):
Narrated Anas bin Malik:There was a state of fear in Medina. Allah's Messenger (ﷺ) rode a horse belonging to Abu Talha (in order to see the matter). The Prophet (ﷺ) said, "We could not see anything, and we found that horse like a sea (fast in speed)
Reference: Bukhari 6212