SB 2.7.51

idaṁ bhāgavataṁ nāma
 yan me bhagavatoditam
saṅgraho ’yaṁ vibhūtīnāṁ
 tvam etad vipulī kuru
Word for word: 
idam — this; bhāgavatam — the science of Godhead; nāma — of the name; yat — that which; me — unto me; bhagavatā — by the Personality of Godhead; uditam — enlightened; saṅgrahaḥ — is the accumulation of; ayam — His; vibhūtīnām — of the diverse potencies; tvam — your good self; etat — this science of Godhead; vipulī — expand; kuru — do it.
Translation: 
O Nārada, this science of God, Śrīmad-Bhāgavatam, was spoken to me in summary by the Supreme Personality of Godhead, and it was spoken as the accumulation of His diverse potencies. Please expand this science yourself.
Purport: 

The Bhāgavatam in a nutshell, spoken by the Personality of Godhead in about half a dozen verses, which will appear ahead, is the science of God, and it is the potent representation of the Personality of Godhead. He, being absolute, is nondifferent from the science of God, Śrīmad-Bhāgavatam. Brahmājī received this science of Godhead from the Lord directly, and he handed over the same to Nārada, who in his turn ordered Śrīla Vyāsadeva to expand it. So the transcendental knowledge of the Supreme Lord is not mental speculation by the mundane wranglers, but is uncontaminated, eternal, perfect knowledge beyond the jurisdiction of material modes. The Bhāgavata Purāṇa is therefore the direct incarnation of the Lord in the form of transcendental sound, and one should receive this transcendental knowledge from the bona fide representative of the Lord in the chain of disciplic succession from the Lord to Brahmājī, from Brahmājī to Nārada, from Nārada to Vyāsa, from Vyāsadeva to Śukadeva Gosvāmī, from Śukadeva Gosvāmī to Sūta Gosvāmī. The ripened fruit of the Vedic tree drops from one hand to another without being broken by falling suddenly from a high branch down to the earth. Therefore unless one hears the science of Godhead from the bona fide representative of the disciplic succession, as above mentioned, for one to understand the theme of the science of Godhead will be a difficult job. It should never be heard from the professional Bhāgavatam reciters who earn their livelihood by gratifying the senses of the audience.