Shatapatha Brahmana 6.3.1.9

6.3.1.9

yadveva sruvaśca srukca | yo vai sa prajāpatirāsīdeṣa sa sruvaḥ prāṇo vai sruvaḥ prāṇaḥ prajāpatiratha yā sā vāgāsīdeṣā sā srugyoṣā vai vāgyoṣā srugatha yāstā āpa āyanvāco lokādetāstā yāmetāmāhutiṃ juhoti

And, again, why there are an offering-spoon and a dipping-spoon,--what Pragâpati was, that indeed is this dipping-spoon, for the dipping-spoon is the breath, and the breath is Pragâpati. And what Vâk (speech) was, that is this offering-spoon; for Vâk is a female, and the offering-spoon (sruk, f.) is a female; and those waters which went forth from the world of Vâk (speech), they are this (ghee) which he offers (in) this libation.