Mbh 12.268.4c

Of him who has uttered for him the syllables Om, Namas, Swaha, Svadha, and Vashat, and who has, according to the extent of his ability, performed sacrifices and other rites, there is no fear in respect of next life in all the three worlds. Thus say the Vedas, and sages crowned with ascetic success, and the foremost of Rishis. He in whom are the Richs, the Yajuses, the Samans, and the expletives necessary for completing the rhythm of the Samans according to the rules laid down in Vedic grammars, is, indeed, a Brahmana.[1239] Thou knowest, O adorable Brahmana, what the fruits are of Agnihotra, of the Soma-sacrifice, and of the other great sacrifices. I say, for this reason, one should sacrifice and assist at other people's sacrifices, without scruples of any kind. One who performs such sacrifices as lead to heaven (such as Jyotishtoma, etc.) obtains high rewards hereafter in the form of heavenly beatitude. This is certain, viz., that they who do not perform sacrifices have neither this world nor the next. They who are really conversant with the declarations of the Vedas regard both kinds of declarations (viz., those that incite to acts and those that preach abstention) as equally authoritative.'"'"