SB 7.6.28

śrutam etan mayā pūrvaṁ
 jñānaṁ vijñāna-saṁyutam
dharmaṁ bhāgavataṁ śuddhaṁ
 nāradād deva-darśanāt
Synonyms: 
śrutam — heard; etat — this; mayā — by me; pūrvam — formerly; jñānam — confidential knowledge; vijñāna-saṁyutam — combined with its practical application; dharmam — transcendental religion; bhāgavatam — in relationship with the Supreme Personality of Godhead; śuddham — having nothing to do with material activities; nāradāt — from the great saint Nārada; deva — the Supreme Lord; darśanāt — who always sees.
Translation: 
Prahlāda Mahārāja continued: I received this knowledge from the great saint Nārada Muni, who is always engaged in devotional service. This knowledge, which is called bhāgavata-dharma, is fully scientific. It is based on logic and philosophy and is free from all material contamination.