Musnad Abu Ya'la al-Mawsili 117:146

Surayj ibn Yunus narrated to us, Muhammad ibn Yazid narrated to us, from Bakr ibn Khunays, from Sadaqah, from Thabit, from Anas, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "Whoever concerns himself with the hunger of his Muslim brother and feeds him until he is full, and gives him to drink until he is quenched, Allah will forgive him."