GB, 1, 1, 18, 1.0 tasya dvitīyayā svaramātrayāntarikṣaṃ vāyuṃ yajurvedaṃ bhuva iti vyāhṛtiṃ traiṣṭubhaṃ chandaḥ pañcadaśaṃ stomaṃ pratīcīṃ diśaṃ grīṣmam ṛtuṃ prāṇam adhyātmaṃ nāsike gandhaghrāṇam itīndriyāṇy anvabhavat //