Shatapatha Brahmana 14.3.2.24

14.3.2.24

etā vai devatāḥ pravargyaḥ agnirvāyurādityaḥ sarvam vā etā devatā sarvam pravargyaḥ sa yatpravṛktastadagniryadrucitastadvāyuryatpinvitastadasāvādityo yadā vā asāvādityaḥpinvate'thainaṃ sarve devāḥ sarvāṇi bhūtānyupajīvanti pinvate ha vā asmā asāvādityo ya evametadveda

The Pravargya, indeed, is those deities--Agni, Vâyu, and Âditya; for those deities are everything, and the Pravargya is everything: when it is placed on the fire then it is Agni; when it is burning-hot then it is Vâyu (the wind); and when it flows over then it is Âditya (the sun);--but, indeed, when yonder sun overflows, all the gods and all beings subsist upon him; and, verily, yonder sun overflows for him who thus knows this.