Shatapatha Brahmana 13.1.7.4

13.1.7.4

triṃśatamaudgrabhaṇāni juhoti triṃśadakṣarā virāḍvirāḍu kṛtsnamannaṃ kṛtsnasyaivānnādyasyāvaruddhyai catvāryaudgrabhaṇāni juhoti trīṇi vaiśvadevāni sapta sampadyante sapta vai śīrṣaṇyāḥ prāṇāḥ prāṇā prāṇairevāsmai prāṇāndīkṣāmavarunddhe pūrṇāhutimuttamāṃ juhoti pratyuttabdhyai sayuktvāya

Thirty Audgrabhanas he offers,--of thirty syllables the Virâg (metre) consists, and the Virâg means all food: thus (he offers) for the obtainment of all food. Four Audgrabhanas he offers (on each day), and three Vaisvadevas;--they amount to seven; for there are seven vital airs of the head, and the Dîkshâ is the vital airs: by means of the vital airs he thus gains the Dîkshâ, the vital airs, for him. A full (-spoon)-oblation he offers last for the sake of invigoration and union.