Mbh 13.23.4d

That Brahmana, O king, who eats on occasions of similar rites performed by persons belonging to the three higher orders, at a time when he is impure in consequence either of a birth or a death among his cognates, through temptation, knowing well that he is impure incurs the same sin.[225] He who lives upon wealth obtained under false pretences like that of sojourns to sacred places or who solicits the giver for wealth pretending that he would spend it in religious acts, incurs, O monarch, the sin of uttering a falsehood.[226] That person, belonging to any of the three higher orders, O Yudhishthira, who at Sraddhas and on other occasions distributes food with the aid of Mantras, unto such Brahmanas as do not study the Vedas and as are not observant of vows, or as have not purified their conduct, certainly incurs sin."