Vyasasmriti 1.9

1.9

brāhmaṇyāṃ śūdrajanitaścāṇḍālo dharmavarjitaḥ
kumārīsambhavastvekaḥ sagotrāyāṃ dvitīyakaḥ

One begotten by a Śūdra on a brahmin woman is a cāṇḍāla, excluded from socio-religious duty.
One is born of an unmarried girl; a second, of a woman of the same clan;