Mbh 13.9.5a

"'Bhishma continued, "I heard this, O king, from my preceptor while he was engaged in discoursing upon the subject of Brahmanas. I heard this from that righteous person when he recited the old and sacred declaration on this topic. I heard this from Krishna also, O king, while he was engaged in discoursing, O son of Pandu, upon Brahmanas.[14] The property of a Brahmana should never be appropriated. They should always be let alone. Poor, or miserly, or young in years, they should never be disregarded. The Brahmanas have always taught me this. Having promised to make them a gift, the gift should be made. A superior Brahmana should never be disappointed in the matter of his expectations. A Brahmana, O king, in whom an expectation has been raised, has, O king, been said to be like a blazing fire.[15] That man upon whom a Brahmana with raised expectations casts his eye, is sure, O monarch, to be consumed even as a heap of straw is capable of being consumed by a blazing fire.[16] When the Brahmana, gratified (with honours and gifts) by the king addresses the king in delightful and affectionate words, he becomes, O Bharata, a source of great benefit to the king, for he continues to live in the kingdom like a physician combating against diverse ills of the body.[17] Such a Brahmana is sure to maintain by his puissance and good wishes, the sons and grandsons and animals and relatives and ministers and other officers and the city and the provinces of the king.[18] Even such is the energy, so great, of the Brahmana like unto that of the thousand-rayed Surya himself, on the Earth. Therefore, O Yudhishthira, if one wishes to attain to a respectable or happy order of being in one's next birth, one should, having passed the promise to a Brahmana, certainly keep it by actually making the gift to him. By making gifts to a Brahmana one is sure to attain to the highest heaven. Verily, the making of gifts is the highest of acts that one can achieve.