Mbh 12.297.6a

"'"Parasara said, 'Acceptance of gifts, officiation at the sacrifices of others, and the teaching of pupils, O king, are the especial duties of the Brahmanas. The protection of the other orders is proper for the Kshatriya. Agriculture, cattle-rearing, and trade are the occupations of the Vaisyas. While service of the (three) regenerate classes is the occupation, O king, of the Sudras. I have now told thee what the especial duties are of the four orders, O monarch. Listen now to me, O child, as I tell thee what the common duties are of all the four orders. Compassion, abstention from injury, heedfulness, giving to others what is due to them, Sraddhas in honour of deceased ancestors, hospitality to guests, truthfulness, subjugation of wrath, contentedness with one's own wedded wives, purity (both internal and external), freedom from malice, knowledge of Self, and Renunciation,--these duties, O king, are common to all the orders. Brahmanas, Kshatriyas, and Vaisyas,--these are the three regenerate orders. All of them have an equal right to the performance of these duties, O foremost of men. These three orders, betaking themselves to duties other than those laid down for them, come to grief, O monarch (and fall down from their own status), even as they go up and acquire great merit by taking for their model some righteous individual of their respective classes who is duly observant of his own duties. The Sudra never falls down (by doing forbidden acts); nor is he worthy of any of the rites of regeneration. The course of duties flowing from the Vedas is not his. He is not interdicted, however, from practising the three and ten duties that are common to all the orders. O ruler of the Videhas, Brahmanas learned in the Vedas, O monarch, regard a (virtuous) Sudra as equal to Brahmana himself. I, however, O king, look upon such a Sudra as the effulgent Vishnu of the universe, the foremost one in all the worlds.