Śatapatha Brāhmaṇa ("of a hundred paths") 9.2.3.18

9.2.3.18

ukṣā samudro aruṇaḥ suparṇa iti | ukṣā hyeṣa samudro 'ruṇaḥ suparṇaḥ pūrvasya yonim piturāviveśeti pūrvasya hyeṣa etaṃ yonim piturāviśati madhye divo nihitaḥ pṛśniraśmeti madhye hyeṣa divo nihitaḥ pṛśniraśmā vicakrame rajasaspātyantāviti vikramamāṇo vā eṣa eṣāṃ lokānāmantānyāti

'The showering ocean, the ruddy bird,'--for he (the sun) is indeed a showering ocean, and a ruddy bird,--'hath entered the seat of his easterly father,'--for he indeed enters that seat of his easterly father;--'the many-hued rock set up in the middle of the sky,'--for that variegated stone is indeed set up in the middle of the sky;--'hath traversed and guardeth the two ends of the atmosphere;'--for in traversing he guards the ends of these worlds.