Śatapatha Brāhmaṇa ("of a hundred paths") 7.4.2.23

7.4.2.23

virāḍjyotiradhārayaditi | ayaṃ vai loko virāṭ sa imamagniṃ jyotirdhārayati svarāḍjyotiradhārayadityasau vai lokaḥ svarāṭ so mumādityaṃ jyotirdhārayati virāḍvahemau lokau svarāṭca nānopadadhāti nānā hīmau lokau sakṛtsādayati samānaṃ tatkaroti tasmādu hānayorlokayorantāḥ samāyanti

[He lays them down, with Vâg. S. XIII, 24] 'The wide-ruling one contained the light;' the wide-ruling ones doubtless is this (terrestrial) world: it contains this fire, the light.--'The self-ruling one contained the light,' the self-ruling one doubtless is yonder world: it contains yonder sun, the light. And the wide-ruling one and the self-ruling one being these two worlds, he lays them down separately, for separate are these two worlds. He 'settles' them once: he thereby makes them one and the same (or, joined together), whence the ends of these two worlds meet.