Śatapatha Brāhmaṇa ("of a hundred paths") 3.8.3.21

3.8.3.21

vātasya tvā dhrājyā iti | antarikṣaṃ vā ayamanupavate yo 'yam pavate 'ntarikṣāya vai gṛhṇāti tasmādāha vātasya tvā dhrājyā iti

'For the sweeping of the wind--thee!' for verily yonder blower sweeps along the air, and for the air he takes it: hence he says, 'For the sweeping of the wind (I take) thee.'