Mahabharata Anushasna Parva Chapter 143:3

Mahabharata Anushasna Parva (Dana Dharma Parva) Chapter 143:3 Always adhering to the path of righteousness, the Sudra should cheerfully do all this. He should honour the deities and persons of the regenerate orders. He should observe the vow of hospitality to all persons. With senses kept under subjection and becoming abstemious in food, he should never approach his wife except in her season. He should ever search after persons that are holy and pure. As regards food, he should eat that which remains after the needs of all persons have been satisfied. If, indeed, the Sudra desires to be a Vaisya (in his next life), he should also abstain from meat of animals not slain in sacrifices. If a Vaisya wishes to be a Brahmana (in his next life), he should observe even these duties. He should be truthful in speech, and free from pride or arrogance. He should rise superior to all pairs of opposites (such as heat and cold, joy and sorrow, etc.) He should be observant of the duties of peace and tranquillity. He should adore the deities in sacrifices, attend with devotion to the study and recitation of the Vedas, and become pure in body and mind. He should keep his senses under subjection, honour the Brahmanas, and seek the welfare of all the orders. Leading the domestic mode of life and eating only twice a day at the prescribed hours he should gratify his hunger with only such food as remains after the needs have been satisfied of all the members of his family with dependants and guests. He should be abstemious in food, and act without being impelled by the desire of reward. He should be free from egotism. He should adore the deities in the Agnihotra and pour libations according to the ordinance. Observing the duties of hospitality towards all persons, he should, as already said, eat the food that remains after serving all others for whom it has been cooked. He should, according to the ordinance laid down, worship the three fires. Such a Vaisya of pure conduct takes birth in his next life in a high Kshatriya family.[] If a Vaisya, after having taken birth as a Kshatriya, goes through the usual purificatory rites, becomes invested with the sacred thread, and betakes himself to the observance of vows, he becomes, in his next life, an honoured Brahmana. Indeed, after his birth as a Kshatriya, he should make presents, adore the deities in great sacrifices with plentiful Dakshinas, study the Vedas, and desirous of attaining to Heaven should worship the three fires. He should interfere for dispelling the sorrows of the distressed, and should always righteously cherish and protect those subjects that own his sway. He should be truthful, and do all acts that have truth in them, and seek happiness in conduct like this. He should award punishments that are righteous, without laying aside the rod of chastisement for good. He should induce men to do righteous deeds. Guided by considerations of policy (in the matter of swaying his people), he should take a sixth of the produce of the fields.[]