Sahih Bukhari
Sahih Bukhari Volume 004, Book 052, Hadith Number 058.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 52. Fighting for the Cause of Allah (Jihaad)
Narated By Jundab bin Sufyan : In one of the holy Battles a finger of Allah's Apostle (got wounded and) bled. He said, "You are just a finger that bled, and what you got is in Allah's Cause."