Śatapatha Brāhmaṇa ("of a hundred paths") 13.2.8.5

13.2.8.5

apa vā etebhyaḥ prāṇāḥ krāmanti ye yajñe dhuvanaṃ tanvate nava kṛtvaḥ pariyanti nava vai prāṇāḥ prāṇānevātmandadhate naibhyaḥ prāṇā apakrāmantyāhamajāni garbhadhamā tvamajāsi garbhadhamiti prajā vai paśavo garbhaḥ prajāmeva paśūnātmandhatte tā ubhau caturaḥ padaḥ samprasārayāveti mithunasyāvaruddhyai svarge loke prorṇuvāthāmityeṣa vai svargo loko yatra paśuṃ saṃjñapayanti tasmādevamāha vṛṣā vājī retodhā reto dadhātviti mithunasyaivāvaruddhyai

But, indeed, the vital airs depart from those who perform the fanning at the sacrifice. Nine times they walk round; for there are nine vital airs: vital airs they thus put into their own selves, and the vital airs do not depart from them. 'I will urge the seed-layer, urge thou the seed-layer!' (the Mahishî says);--seed, doubtless, means offspring and cattle: offspring and cattle she thus secures for herself. [Vâg. S. XXIII, 20,] 'Let us stretch our feet,' thus in order to secure union. 'In heaven ye envelop yourselves' (the Adhvaryu says),--for that is, indeed, heaven where they immolate the victim: therefore he speaks thus.--'May the vigorous male, the layer of seed, lay seed!' she says in order to secure union.