The Mahabharata of Krishna-Dwaipayana Vyasa…
“ The Sudra should perform all the duties laid down for him, properly and according to the ordinance. He should always wait, with obedience and humility, upon person of the three other orders and serve them with care. 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. ”
