Śatapatha Brāhmaṇa ("of a hundred paths") 8.7.3.10

8.7.3.10

yadveva vikarṇīmupadadhāti | yatra vā ado 'śvaṃ citimavaghrāpayanti tadasāvāditya imāṃlokāntsūtre samāvayate tadyattatsūtraṃ vāyuḥ sa sa yaḥ sa vāyureṣā sā vikarṇī tadyadetāmupadadhātyasāveva tadāditya imāṃlokāntsūtre samāvayate

And, again, as to why he lays down the Vikarnî. When, on that (former) occasion, they make the horse smell (the pile of bricks of) the (first) layer, then yonder sun strings these worlds to himself on a thread. Now that thread is the same as the wind; and that wind is the same as this Vikarnî: thus when he lays down the latter, then yonder sun strings to himself these worlds on a thread.