O Uddhava, in the lotus millennium in the days of yore, at the beginning of the creation, I spoke unto Brahmā, who is situated on the lotus that grows out of My navel, about My transcendental glories, which the great sages describe as Śrīmad-Bhāgavatam.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
पुरा मया प्रोक्तमजाय नाभ्ये पद्मे निषण्णाय ममादिसर्गे । ज्ञानं परं मन्महिमावभासं यत्सूरयो भागवतं वदन्ति
purā mayā proktamajāya nābhye padme niṣaṇṇāya mamādisarge | jñānaṃ paraṃ manmahimāvabhāsaṃ yatsūrayo bhāgavataṃ vadanti
SB 3.4.13