With Soṇadaṇḍa 13.5

13.5

Idha, bho gotama, brāhmaṇo ubhato sujāto hoti mātito ca pitito ca, saṃsuddhagahaṇiko yāva sattamā pitāmahayugā akkhitto anupakkuṭṭho jātivādena;

It’s when a brahmin is well born on both his mother’s and father’s side, stemming from a clean vessel, with irrefutable and impeccable genealogy back to the seventh paternal generation.