Shloka 5
Adhyāya 166: Kṛtaghna-doṣa (कृतघ्नदोषः) — the fault of ingratitude and the limits of expiation
यस्य त्रैवार्षिकं भक्त पर्याप्तं भृत्यवृत्तये । अधिकं चापि विद्येत स सोम॑ पातुमहति
yasya traivārṣikaṃ bhaktaṃ paryāptaṃ bhṛtya-vṛttaye | adhikaṃ cāpi vidyeta sa somaṃ pātum arhati ||
ビーシュマは言った。「己に依り頼む者たちを養うため、三年に足る糧と財を備え、なお余裕さえ有するバラモンのみが、ソーマを飲むにふさわしい。その者こそソーマ祭（ソーマ・ヤジュニャ）を執り行うべきである。なぜならこの儀礼は、欠乏からではなく、安定した生計と家を支える責務の上に立って行われるべきものだからである。」
भीष्म उवाच
Educational Q&A
Ritual privilege (Soma-drinking/Soma-sacrifice) is tied to ethical readiness: a Brahmin should first be able to sustain dependents securely (at least three years’ provisions, preferably surplus). The rite is not to be pursued at the cost of household responsibility.
In Bhishma’s instruction during the Shanti Parva, he lays down a criterion for who is qualified to perform the Soma-sacrifice: only one with adequate, stable resources for maintaining dependents is considered fit for Soma-drinking and thus for undertaking the Soma-yajña.