Vishnupurana 3.10.3

3.10.3

aurva uvāca
yadetaduktaṃ bhavatā nityanaimittikāśrayam /
tadahaṃ kathayiṣyāṃmi śṛṇuṣvaikamanā mama //

SAGARA then addressed Aurva, and said, "You have described to me, venerable Brahman, the duties of the four orders and of the four castes. I am now desirous to hear from you the religious institutes which men should individually observe, whether they be invariable, occasional, or voluntary. Describe these to me; for all things are known, chief of Bhrigu's race, unto you." To this Aurva replied, "I will communicate to you, oh king, that which you have asked, the invariable and occasional rites which men should perform: do you attend.