Shatapatha Brahmana 13.7.1.6

13.7.1.6

vaiśvadevaścaturthamaharbhavati viśve vai sarve devāḥ sarveṣāṃ devānāmāptyai vaiśvadevā grahā bhavanti vaiśvadevyaḥ parorucaḥ sarvam vaiśvadevamasaditi

The fourth day is a Vaisvadeva, for the sake of his gaining and winning all the gods, for the All-gods (Visve Devâh) are all the gods. The cups of Soma pertain to the All-gods, and so do the Puroruk formulas pertain to the All-gods, in order that everything should pertain to the All-gods.