O learned brāhmaṇas, when Śukadeva Gosvāmī recited Bhāgavatam there [in the presence of Emperor Parīkṣit], I heard him with rapt attention, and thus, by his mercy, I learned the Bhāgavatam from that great and powerful sage. Now I shall try to make you hear the very same thing as I learned it from him and as I have realized it.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
कलौ नष्टदृशामेष पुराणार्कोऽधुनोदितः । तत्र कीर्तयतो विप्रा विप्रर्षेर्भूरितेजसः
kalau naṣṭadṛśāmeṣa purāṇārko'dhunoditaḥ | tatra kīrtayato viprā viprarṣerbhūritejasaḥ
SB 1.3.44