Sahih Bukhari
Sahih Bukhari Volume 005, Book 059, Hadith Number 373.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 59. Military Expeditions Led by the Prophet (PBUH) (Al-Maghaazi)
Narrated By Ibn Abbas: On the day of Uhud. the Prophet said, "This is Gabriel holding the head of his horse and equipped with war material."