Sahih Bukhari Volume 008, Book 073, Hadith Number 035.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 73. Good Manners and Form (Al-Adab)
Narated By Safwan bin Salim : The Prophet said "The one who looks after and works for a widow and for a poor person, is like a warrior fighting for Allah's Cause or like a person who fasts during the day and prays all the night." Narrated Abu Huraira that the Prophet said as above.