Aggannasutta 23.6

23.6

Iti kho, vāseṭṭha, evametassa brāhmaṇamaṇḍalassa porāṇena aggaññena akkharena abhinibbatti ahosi tesaṃyeva sattānaṃ, anaññesaṃ sadisānaṃyeva no asadisānaṃ dhammeneva, no adhammena.

And that, Vāseṭṭha, is how the ancient primordial terms for the circle of brahmins were created; for those very beings, not others; for those like them, not unlike; by virtue of principle, not against principle.