When one eats and drinks [on the festivals], one must also feed the stranger, the orphan, the widow, and the other unfortunate paupers. But one who locks the doors of his courtyard and feasts and drinks with his children and wife but does not feed the poor and the embittered -- this is not the joy of mitzvah but the joy of his stomach
Maimonides' Mishneh Torah, Laws of the Festivals 6:18