Śatapatha Brāhmaṇa ("of a hundred paths") 11.2.7.17

11.2.7.17

rāṣṭraṃ sāṃnāyyaṃ sa yo ha vai rāṣṭraṃ sāṃnāyyamiti vedāva ha rāṣṭraṃ runddhe'tho yatkiṃ ca rāṣṭreṇa ja yyaṃ sarvaṃ haiva tajjayati tadyatsaṃnayantyeke naike tasmādrāṣṭraṃ saṃ caiti vi ca

The Sânnâyya is royal dignity; and, verily, whosoever knows the Sânnâyya to be royal dignity secures for himself royal dignity; and whatever is to be gained by royal dignity all that he gains. And inasmuch as some pour (sweet and sour milk) together, and others do not, therefore the royal dignity both (combines) together and (keeps) asunder.