Adhyāya 166: Kṛtaghna-doṣa (कृतघ्नदोषः) — the fault of ingratitude and the limits of expiation
ब्राह्मणस्तु सुरापस्य गन्धमादाय सोमप:
brāhmaṇas tu surāpasya gandham ādāya somapaḥ |
Bhīṣma said: “If a Soma-drinking brāhmaṇa so much as takes in the odor of a liquor-drinker, he should undertake a purificatory observance: for three days he should subsist on hot water; then for three days on hot milk; and after those three days, for three days he should live only on air (that is, fast completely). By this discipline he becomes purified.”
भीष्म उवाच
The verse teaches that even indirect contact with intoxicants (here, merely smelling a drunkard) is treated as a serious impurity for a Soma-qualified Brahmin, and that purity is restored through a structured, time-bound penance emphasizing restraint and bodily discipline.
In Bhishma’s instruction on dharma in the Shanti Parva, he lays down a specific expiation: three days on hot water, three days on hot milk, and three days living only on air, after which the Brahmin is considered purified.