Sahih Bukhari
Sahih Bukhari Volume 004, Book 053, Hadith Number 348.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 53. One-Fifth Of Booty to the Cause Of Allah (Khumus)
Narated By 'Urwa-al-Bariqi : The Prophet said, "Horses are always the source of good, namely, rewards (in the Hereafter) and booty, till the Day of Resurrection."