Shatapatha Brahmana 10.3.5.1

10.3.5.1

ayaṃ vāva yajuryo'yam pavate eṣa hi yannevedaṃ sarvaṃ janayatyetaṃ yantamidamanu prajāyate tasmādvāyureva yajuḥ

Now, the Yagus, indeed, is he who blows here, for even whilst passing along he (Vâyu, the wind) generates (vivifies) everything here, and after him passing along everything is generated: this is why the Yagus is no other than Vâyu.