Śatapatha Brāhmaṇa ("of a hundred paths") 2.5.2.34

2.5.2.34

kṛtānukara eva pratiprasthātā | kṣatraṃ vai varuṇo viśo marutastatkṣatrāyaivaitadviśaṃ kṛtānukarāmanuvartmānaṃ karoti pratyudyāminīṃ ha kṣatrāya viśaṃ kuryādyadapi pratiprasthātāśrāvayettasmānna pratiprasthātāśrāvayati

The Pratiprasthâtri is merely the imitator of what is done (by the Adhvaryu). For Varuna is the nobility, and the Maruts are the people: hence he thereby makes the people the imitators, the followers of the nobility. But were the Pratiprasthâtri also to call for the 'Sraushat,' he would doubtless make the people equal in power to the nobility: for this reason the Pratiprasthâtri does not call for the 'Sraushat.'