Shatapatha Brahmana 14.3.2.23

14.3.2.23

ime vai lokāḥ pravargyaḥ sarvam vā ime lokāḥ sarvam pravargyaḥ sa yatpravṛktastadayaṃ loko yadrucitastadantarikṣaloko yatpinvitastadasau loko yadā vā asau lokaḥ pinvate'thainaṃ sarve devāḥ sarvāṇi bhūtānyupajīvanti pinvate ha vā asm: asau loko ya evametadveda

The Pravargya, indeed, is these worlds, for these worlds are everything, and the Pravargya is everything: when it is placed on the fire then it is this (terrestrial) world; when it is burning-hot then it is the air-world; and when it flows over then it is yonder (heavenly) world;--but, indeed; when yonder world overflows, all the gods and all beings subsist thereon; and, verily, yonder world overflows for him who thus knows this.