Mbh 13.121.4a

"'"Maitreya said. 'Thy words on the subject of Gift are faultless and pure. Without doubt, thy soul has been cleansed by knowledge and penances. In consequence of thy soul being cleansed, even this is the great advantage I reap from it. With the aid of my understanding I see that thou art endued with high penances. As regards ourselves we succeed in acquiring prosperity through only a sight of personages like thee I think, that is due to thy grace and flows from the nature of my own acts.[535] Penances, knowledge of the Vedas, and birth in a pure race,--these are the causes of the status which one acquires of a Brahmana. When one has these three attributes, then does he come to be called a regenerate person. If the Brahmana be gratified, the Pitris and the deities are also gratified. There is nothing superior to a Brahmana possessed of Vedic lore. Without the Brahmana, all would be darkness. Nothing would be known. The four orders would not exist. The distinction between Righteousness and Unrighteousness, Truth and Falsehood, would cease. On a well-tilled field, an abundant harvest can be reaped. Even so, one may reap great merit by making gifts unto a Brahmana possessed of great learning. If there were no Brahmanas endued with Vedic lore and good conduct for accepting gifts, the wealth possessed by wealthy people would be useless. The ignorant Brahmana, by eating the food that is offered to him, destroys what he eats (for it produces no merit to him who gives it). The food that is eaten also destroys the eater (for the eater incurs sin by eating what is offered to him). That ought to be properly termed an eatable which is given away to a deserving man, in all other cases, he that takes it makes the donor's gift thrown away and the receiver is likewise ruined for his improperly accepting it. The Brahmana possessed of learning becomes the subjugator of the food that he eats. Having eaten it, he begets other food.