Anushasana Parva 37.14

By satisfying the debt one owes to the deities by performing sacrifices, that to the Rishis by studying the Vedas, that to the departed manes by procreating children, that to the Brahmanas by making presents to them, and that to guests by feeding them, in due order, and with purity of motive, and properly attending to the ordinances of the scriptures, a householder does not fall away from virtue.