Srimad-Bhagavatam: Canto 3 - Chapter 1 - Verse 3

Sanskrit:

आसीनमुर्व्यां भगवन्तमाद्यंसङ्कर्षणं देवमकुण्ठसत्त्वम् ।विवित्सवस्तत्त्वमत: परस्यकुमारमुख्या मुनयोऽन्वपृच्छन् ॥ ३ ॥

ITRANS:

āsīnam urvyāṁ bhagavantam ādyaṁsaṅkarṣaṇaṁ devam akuṇṭha-sattvamvivitsavas tattvam ataḥ parasyakumāra-mukhyā munayo ’nvapṛcchan

Translation:

Some time ago, being inquisitive to know, Sanat-kumāra, the chief of the boy-saints, accompanied by other great sages, inquired exactly like you about the truths regarding Vāsudeva, the Supreme, from Lord Saṅkarṣaṇa, who is seated at the bottom of the universe.

Purport:

This is in clarification of the statement that the Lord spoke directly on the Śrīmad-Bhāgavatam. When and unto whom the Bhāgavatam was spoken is explained herewith. Questions similar to those put forward by Vidura were asked by great sages like Sanat-kumāra, and Lord Saṅkarṣaṇa, the plenary expansion of the Supreme Lord Vāsudeva, answered them.