Sahih Bukhari
Fighting for the Cause of Allah (Jihaad)
Volume: 004 / Book Number: 052 / Hadith Number: 109
Narrated Anas bin Malik:
Once there was a feeling of fright in Medina, so the Prophet borrowed a horse belonging to us called Mandub (and he rode away on it). (When the Prophet returned) he said, "I have not seen anything of fright and I found it (i.e. this horse) very fast."