Musnad Ahmad

It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that he submitted in the court of the Messenger, "O Messenger of Allah! Which charity is the best?" The Noble Prophet (peace and blessings be upon him) said, "The charity given by a person who is himself in financial difficulty, by working hard and giving charity (is the best). And (remember) begin charity with those who are under your responsibility."