Mbh 12.294.1b

The Brahmanas should only enjoy. As regards the Sudras, they should engage themselves in the task of humbly and honestly collecting together the articles that are to be offered in sacrifices, and in cleaning altars and other places where sacrifices are to be performed. If each order acts in this way, righteousness would not suffer any diminution. If righteousness is preserved in its entirety, all creatures inhabiting the earth would be happy. Beholding the happiness of all creatures on earth, the deities in heaven become filled with gladness. Hence, that king who, agreeably to the duties laid down for his order, protects the other classes, becomes worthy of respect. Similarly, the Brahmana that is employed in studying the scriptures, the Vaisya that is engaged in earning wealth, and the Sudra that is always engaged in serving the three other classes with concentrated attention, become objects of respect. By conducting themselves in the other ways, O chief of men, each order is said to fall away from virtue. Keeping aside gifts by thousands, even twenty cowries that one may give painfully, having earned them righteously, will be productive of the great benefit. Those persons, O king, who make gifts unto Brahmanas after reverencing them duly, reap excellent fruits commensurate with those gifts. That gift is highly prized which the donor makes after seeking out the donee and honouring him properly. That gift is middling which the donor makes upon solicitation. That gift, however, which is made contemptuously and without any reverence, is said to be very inferior (in point of merit). Even this is what those utterers of the truth, viz., the sages, say. While sinking in this ocean of life, man should always seek to cross that ocean by various means. Indeed, he should so exert himself that he might be freed from the bonds of this world.