Padmapurana 6.117.23

Padmapurāṇa 6.117.23

īśvarauvāca
brāhmaṃkṛtayugaṃproktaṃtretātukṣatriyaṃsvayam
dvāparaṃvaiśyamityāhuḥśūdraṃkaliyugaṃsmṛtam