Shatapatha Brahmana 9.1.2.38

9.1.2.38

vāmadevyamātman | prāṇo vai vāmadevyaṃ vāyuru prāṇaḥ sarveṣāmu haiṣa devānāmātmā yadvāyurvāyumevāsyaitadātmānaṃ karotyatho ātmānamevāsyaitadanasthikamamṛtaṃ karoti

The Vâmadevya (hymn he sings) on the body (of the altar); for the Vâmadevya is the breath, and the breath is air (vâyu, the wind), and he, Vâyu, doubtless, is the self (body) of all the gods: he thus makes the air (wind) his body, and that body of his he thus makes boneless and immortal.