Mbh 12.189.2a

"'"Bhrigu said, 'That person is called a Brahmana who has been sanctified by such rites as those called jata and others; who is pure in behaviour; who is engaged in studying the Vedas; who is devoted to the six well-known acts (of ablutions every morning and evening, silent recitation of mantras, pouring libations on the sacrificial fire, worshipping the deities, doing the duties of hospitality to guests, and offering food to the Viswedevas); who is properly observant of all pious acts; who never takes food without having offered it duly to gods and guests; who is filled with reverence for his preceptor; and who is always devoted to vows and truth. He is called a Brahmana in whom are truth, gifts, abstention from injury to others, compassion, shame, benevolence,[564] and penance. He who is engaged in the profession of battle, who studies the Vedas, who makes gifts (to Brahmanas) and takes wealth (from those he protects) is called a Kshatriya. He who earns fame from keep of cattle, who is employed in agriculture and the means of acquiring wealth, who is pure in behaviour and attends to the study of the Vedas, is called a Vaisya.[565] He who takes pleasure in eating every kind of food, who is engaged in doing every kind of work, who is impure in behaviour, who does not study the Vedas, and whose conduct is unclean, is said to be a Sudra. If these characteristics be observable in a Sudra, and if they be not found in a Brahmana, then such a Sudra is no Sudra, and, such a Brahmana is no Brahmana. By every means should cupidity and wrath be restrained. This as also self-restraint, are the highest results of Knowledge. Those two passions (viz., cupidity and wrath), should, with one's whole heart, be resisted. They make their appearance for destroying one's highest good. One should always protect one's prosperity from one's wrath, one's penances from pride; one's knowledge from honour and disgrace; and one's soul from error.