Mahabharata Anushasna Parva Chapter 23:3

Mahabharata Anushasna Parva (Dana Dharma Parva) Chapter 23:3 That Brahmana who having earned wealth in the morning becomes poor in the afternoon, or who poor in the morning becomes wealthy in the evening or who is destitute of malice, or is stained by a minor fault, deserves, O king, to be invited to Sraddhas. That Brahmana who is destitute of pride or sin, who is not given to dry disputation, or who subsists upon alms obtained in his rounds of mendicancy from house to house deserves, O king, to be invited to sacrifices. One who is not observant of vows, or who is addicted to falsehood (in both speech and conduct), who is a thief, or who subsists by the sale of living creatures or by trade in general, becomes worthy of invitation to Sraddhas, O king, if he happens to offer all to the deities first and subsequently drink Soma. That man who having acquired wealth by foul or cruel means subsequently spends it in adoring the deities and discharging the duties of hospitality, becomes worthy, O king, of being invited to Sraddhas. The wealth that one has acquired by the sale of Vedic lore, or which has been earned by a woman, or which has been gained by meanness (such as giving false evidence in a court of law), should never be given to Brahmanas or spent in making offerings to the Pitris. That Brahmana, O chief of Bharata's race, who upon the completion of a Sraddha that is performed with his aid, refuses to utter the words 'astu swadha,' incurs the sin of swearing falsely in a suit for land. The time for performing Sraddha, O Yudhishthira, is that when one obtains a good Brahmana and curds and ghee and the sacred day of the new moon, and the meat of wild animals such as deer and others. Upon the completion of a Sraddha performed by a Brahmana the word Swadha should be uttered. If performed by a Kshatriya the words that should be uttered are—Let thy Pitris be gratified.—Upon the completion of a Sraddha performed by a Vaisya, O Bharata, the words that should be uttered are—Let everything become inexhaustible.—Similarly, upon the conclusion of a Sraddha performed by a Sudra, the word that should be uttered is Swasti,—In respect of a Brahmana, the declaration regarding Punyaham should be accompanied with the utterance of the syllable Om. In the case of a Kshatriya, such declaration should be without the utterance of syllable Om. In the rites performed by a Vaisya, the words that should be uttered, instead of being the syllable Om, are,—Let the deities be gratified.—Listen now to me as I tell thee the rites that should be performed, one after another, conformably to the ordinances, (in respect of all the orders). All the rites that go by the name of Jatakarma, O Bharata, are indispensable in the case of all the three orders (that are regenerate). All these rites, O Yudhishthira, in the case of both Brahmanas and Kshatriyas as also in that of Vaisyas are to be performed with the aid of mantras.