Adhyāya 166: Kṛtaghna-doṣa (कृतघ्नदोषः) — the fault of ingratitude and the limits of expiation
परिवेष्टाग्निहोत्रस्य भवेन्नासंस्कृतस्तथा । न कन्या, न युवती, न मन्त्र न जाननेवाला, न मूर्ख और न संस्कारहीन पुरुष ही अग्निमें हवन करनेका अधिकारी है
pariveṣṭāgnihotrasya bhavennāsaṁskṛtastathā |
毗湿摩曰:行阿耆尼火供(Agnihotra)及其随行诸仪者,未受入门之礼、未加陶冶者,亦不相应。凡不具应有资格者——如女童、未嫁之少女、不知真言者、愚昧之人,或未具规定净化礼(saṃskāra)之男子——皆不当向圣火投献供物。此教诲昭示:吠陀祭仪乃伦理之修持,须经训练、清净与胜任,非一时冲动,亦非为炫示于人。
भीष्म उवाच
Ritual action (like Agnihotra) is governed by dharma: it requires proper preparation—initiation/saṁskāra, knowledge of mantras, and maturity/competence. Without these, performing offerings is considered improper and spiritually/ritually invalid.
In Shanti Parva’s instruction on dharma, Bhishma continues advising Yudhishthira about right conduct. Here he specifies qualifications for Vedic fire-rituals, warning that those lacking training or refinement should not perform havan/Agnihotra.