Rigvedabrahmana 19.8

19.8

mukhaṃ vā etatsaṃvatsarasya yaccaturviṃśaṃ tasmādagniṣṭomo bhavatyagniṣṭomo hi yajñānāṃ mukhaṃ mukhata eva tatsaṃvatsaraṃ prīṇanti taṃ haika
ukthyaṃ kurvanti yajñasyaiva sabhāratāyai tasya caturviṃśastomo bhavati caturviṃśatirvai saṃvatsarasyārdhamāsāḥ saṃvatsarasyaivāptyai tasya trīṇi ṣaṣṭiśatāni stotriyāṇāṃ saṃpadyante trīṇi vai ṣaṣṭiśatāni saṃvatsarasyāhnāṃ saṃvatsarasyaivāptyai tasya bṛhatpṛṣṭhaṃ bhavati dvitīyaṃ vā etadahnāṃ dvitīyaṃ
bṛhatpṛṣṭhānāṃ tasmādasya bṛhatpṛṣṭhaṃ bhavatyatha yaccaturviṃśamaharupayantyavadhṛtaṃ
vā u tacca mahāvrataṃ bṛhadu vā āyatanena mahāvratasya pṛṣṭhaṃ bhavati
tasmādbṛhadaivatasyāhnaḥ pṛṣṭhaṃ syāditi tasya saṃvatsaṃvatsaramabhiparyuditaṃ tasyaitāni chandorūpāṇi hotā janiṣṭhā cetana ityaṣṭarcamājyaṃ gāyatrīmātraṃ
gāyatrīmātro vai stomastadvai śastraṃ samṛddhaṃ yatstomena saṃpadyate mādhucchandasaḥ praugaḥ sa vai samṛddhastasya rūpeṇānye praugāḥ kalpante samṛddhaṃ me
prathamataḥ karma kṛtamasadityā tvā rathaṃ yathotaya iti marutvatīyasya
pratipadidaṃ vaso sutamandha ityanucara eṣa eva nitya ekāhātānastasyoktaṃ brāhmaṇam