Padmapurana 3.33.18

Padmapurāṇa 3.33.18

brāhmaṇāḥkṣatriyāvaiśyāḥśūdrāścavarṇasaṃkarāḥ
striyomlecchāścayecānyesaṃkīrṇāḥpāpayonayaḥ