Sahih Bukhari
Good Manners and Form (Al-Adab)
Volume: 008 / Book Number: 073 / Hadith Number: 35
Narrated 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.