Hazrat Safwan bin Sulaym (may Allah have mercy on him) reports in marfu' form from the Messenger of Allah (peace and blessings be upon him) that he (peace and blessings be upon him) said: "The one who strives for the widow and the needy is like the one who strives in the path of Allah, and like the one who fasts by day and stands in prayer by night."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الوصايا / 12664