Kauthumagrihyasutra 17

Now therefore, concerning the expiations: whether householder or Vedic student, [for] drinking liquor, approaching a Caṇḍāla woman, violating the teacher's bed, killing a brahmin, slaughtering a cow, stealing gold, accepting an improper gift, [or eating] another's food—for the purpose of lightness of transgression and for the benefit of the brahmin priest, I shall declare the expiation. A fast of three nights [is observed]. Having boiled [food] on kindling sticks, then having caused tonsure to be performed, having taken water with a water pot, having bathed in a river, having taken black cow dung with [the formula]: “Born in the heart of the cow, stationed, having purified the world, therefore become purifying, destroy all sins!”, having gathered the cow dung, having mixed it with water, having taken a palāśa leaf, having filled it twelve times with what was gathered, having consecrated it with a hundred syllables of om (praṇava), having smeared it on the head, [offering] the three oblations ending with Brahmā and Agni everywhere as practiced—that brought-about purification is repeated as before. Or else, if a Vedic student [commits] the drinking of liquor, consuming honey, every night without release, without the sacred thread, going naked, guarding a door, chewing betel nut, day-time intercourse, eating again during the day, conversing with a Caṇḍāla, untruth, eating another’s leftovers, eating at a joint day (parvan) rite, an ancestral rite with food portions (sapiṇḍīkaraṇa), or a rite for a single ancestor (ekoddiṣṭa)—in those cases resumption of studentship [is prescribed] because of completeness; because of negligence it is known to be a slight offense. One should not act [contrary] to dharma; the bodily resort fails without it; therefore devoted to dharma, constantly reciting flower-like texts, having become thus, both of them having sipped water again, having performed up to the introductory formula (prapada), having offered the limb of the firewood, then while [the boy] holds on from behind, having offered with the three mystic utterances (vyāhṛtis), the preceptor should offer five [oblations] beginning with “Agne vrata...”. Having caused the student to recite the mantra, the preceptor standing in his own place, the young student facing east, having caused the water to surge up, having filled the hollow of the hands with sacred water, the preceptor having spoken the mantra to the one approaching, should look into the student’s joined palms. “What is your name?” the preceptor asks mentally. The student [answers] in a whisper: “The name connected with the asterism (nakṣatra).” Both having sat in their own places, then having completed the offering above, for the sake of imparting the Sāvitrī [verse]: “We choose that desirable [splendor] of Savitṛ; we meditate upon [the splendor] of the sun-god; may he inspire my thought”, he should silently give the palāśa staff. Then the feeding of brahmins; then the feeding of brahmins.

KauthGS 18: