Manava Dharmashastra 2.26

2.26

mantraprayogā ‘vaidikakarmāṇi’ | ‘vedā’ mantrā ihābhipretāḥ | teṣāṃ yānyuccāraṇāni tāni tatra bhavāni | ato'dhyātmasāditvāṭṭhak | vedamūlatvādvaupacarito vaidikaśabdaḥ | karmaśabdena ca itikarttavyatārūpaṃ karma gṛhyate | tataśca karmabhirniṣekādiḥ saṃskāraḥ kārya iti sādhyasādhanabhedopapattiḥ | pradhānaṃ niṣeko, mantroccāraṇamitikartavyatā |
‘niṣeko’ yonau śukranikṣepaḥ | sa ādiryasya saṃskārakalāpasya vakṣyamāṇasyopanayanaparyantasya | ekavacanaṃ śarīrasaṃskāra iti samudāyāpekṣam | saṃskāraśabdena ca saguṇaśarīra nirvartakamucyate | tatra niṣeko nirvartako'nyāni viśeṣajanakāni |
etadevāha | pāvana iti | pāvayati aśuddhatāmapakarṣatīti pāvanaḥ | pretya ceha ceti | saṃskṛtasya sarvatrātra dṛṣṭādṛṣṭaphaleṣu karmasu kārīrīgyotiṣṭomādiṣvadhikārādubhayalokopakārakatvamāha |
puṇyaiḥ śubhairmaṅgalairiti yāvat | saubhāgyamāvahanti daurbhāgyaṃ cāpamudantīti puṇyapāvanaśabdayorarthabhedaḥ |
dvijanmanāmiti śūdraparyudāsārtham | saṃskāryanirdeśaścāyam | lakṣaṇayā ca traivarṇikāḥ pratīyante | na hi tadānīṃ dvijanmāno bhavanti |

‘Libations in connection with pregnancy,’—thoso that are offered when the pregnancy of the woman has come about,—or those that are offered for the purpose of bringing about pregnancy; in either case the libations are said to be ‘in connection with pregnancy.’ What prompts the offering is the pregnancy, the woman being only a means to it; so that the libations, being prompted by pregnancy, are said to be in connection with it; and these are the rites of ‘Pumsavana,’ ‘Sīmantonnayana’ and ‘Garbhādhāna.’ The word ‘libation’ here stands for the whole rite; as the ‘Garbhādhāna’ (‘Conception’) is certainly not a ‘Libation.’ The exact details of the rites, regarding the substances to be offered, the duties and so forth—arc to be found out from the Gṛhyasūtras.