Manava Dharmashastra 5.70

5.70

sabrahmacārī samānacaraṇo'ta ekodakā rūḍhyā āsapiṇḍebhyaḥ parigṛhyante | teṣāmitaretaraṃ janmani sūtake trirātram | sadyaḥśaucamapi smṛtyantarādudakadāyināṃ vikalpitaṃ draṣṭavyam |

On the death of a fellow-student, the impurity has been declared to last for one day. In the case of a birth, the purity of the ‘Samānopaka’ relations is held to come after three pays.—(70)

Medhātithi’s commentary (manubhāṣya):
‘Fellow-student’—professing the same Vedic Rescension.

‘Samānodaka relations;’—those meant here are to be counted from the point where the ‘Sapiṇḍa-relationship’ censes Among these, when then is a birth, the impurity lasts for three days.

The option of ‘immediate purity’ is also laid down in another Smṛti-text, for ‘Samānodaka’ relations.—(70)

(Verse 71 of other commentators.)

This verse is quoted in Nityācārapradīpa (p. 131);—in Hāralatā (p. 76), which explains ‘ekodaka’ as samānodaka;—and in Śuddhimayūkha (p. 37).

Comparative notes by various authors
Gautama (14.20).—‘The impurity lasts for one night together with the preceding and following days, in the case of the death of a fellow-student.’

Baudhāyana (1.11.30).—‘Let him keep, on account of a pupil, for one who has the same spiritual guide, for a fellow-student,—three days, one day and a night, one day and so forth.’

Āśvalāyana Gṛhyasūtra (4.4.26).—‘One day after the death of a fellow-pupil.’

Pāraskara Gṛhyasūtra (2.11.8).—‘If a fellow-pupil has died, then for three days.’

Gobhila Gṛhyasūtra (3.3.24).—‘Study is interrupted for one day, if a fellow-pupil has died.’