Śatapatha Brāhmaṇa ("of a hundred paths") 7.3.1.45

7.3.1.45

athainā āpyānavatībhyāmabhimṛśati | idamevaitadretaḥ siktamāpyāyayati tasmādyonau retaḥ siktamāpyāyate saumībhyām prāṇo vai somaḥ prāṇaṃ tadretasi dadhāti tasmādretaḥ siktam prāṇamabhisambhavati pūyeddha yadṛte prāṇātsambhavedeṣo haivātra sūdadohāḥ prāṇo vai somaḥ sūdadohāḥ

He then strokes it (the sand) even by means of two verses containing the verb 'to grow:' he thereby causes that infused seed to grow, whence the seed infused into the womb grows;--with two (verses) relating to Soma (he strokes the sand); for Soma is breath: he thus puts breath into the seed; whence the infused seed becomes possessed of breath. But, indeed, were it to come forth without breath it would become putrid; and this indeed is the Sûdadohas in this case; for Soma is breath, and the Sûdadohas is breath.