From Sahih Bukhari (Hadith 6006):
Narrated Safwan bin Salim:The Prophet (ﷺ) 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 (ﷺ) said as above
Reference: Bukhari 6006