Śatapatha Brāhmaṇa ("of a hundred paths") 3.8.1.12

3.8.1.12

atha vācayati | revati yajamāna iti vāgvai revatī sā yadvāgbahu vadati tena vāgrevatī priyaṃ dhā āviśetyanārtimāviśetyevaitadāhororantarikṣātsajūrdevena vātenetyantarikṣaṃ vā anu rakṣaścaratyamūlamubhayataḥ paricinnaṃ yathāyam puruṣo 'mūla ubhayataḥ paricinno 'ntarikṣamanucarati tadvātenainaṃ saṃvidānāntarikṣādgopāyetyevaitadāha yadāhororantarikṣātsajūrdevena vāteneti

He then makes (the Sacrificer) say the text (Vâg. S. VI, 11), 'O thou prosperous! upon the Sacrificer,'--the prosperous one, forsooth, is Speech, it is because she speaks much, that Speech is prosperous,--'bestow thou what is agreeable unto him! Approach thou,'--thereby he means to say, 'Approach thou an existence free from affliction,'--'from the wide air, along with the divine wind;' for the Rakshas moves about the air rootless and unfettered on both sides, even as man here moves about the air rootless and unfettered on both sides: he means to say, 'Meeting together with the wind, protect thou this one from the wide air,' when he says 'from the wide air, along with the divine wind.'