CC Madhya 25.157
ākhyānaṁ yad adhītavān
pariniṣṭhitaḥ — situated; api — although; nairguṇya — in the transcendental position, freed from the material modes of nature; uttamaḥ-śloka-līlayā — by the pastimes of the Supreme Personality of Godhead, Uttamaḥśloka; gṛhīta-cetāḥ — the mind became fully taken over; rājā-ṛṣe — O great King; ākhyānam — the narration; yat — which; adhītavān — studied.
“[Śukadeva Gosvāmī addressed Parīkṣit Mahārāja:] ‘My dear King, although I was fully situated in the transcendental position, I was nonetheless attracted to the pastimes of Lord Kṛṣṇa. Therefore I studied Śrīmad-Bhāgavatam from my father.’
This is a quotation from Śrīmad-Bhāgavatam (2.1.9).