Shatapatha Brahmana 6.6.1.7

6.6.1.7

yadvevaite haviṣī nirvapati | kṣatraṃ vai vaiśvānaro viḍeṣa ādityaścaruḥ kṣatraṃ ca tadviśaṃ ca karoti vaiśvānaram pūrvaṃ nirvapati kṣatraṃ tatkṛtvā viśe karoti

And why he prepares those two (other) oblations,--Vaisvânara is the ruling power, and that Âditya pap is the people: he thus makes both the ruling power and the people. The Vaisvânara (cake) he prepares first, and having thereby made the ruling power, he makes the people.