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.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
इदं भागवतं नाम यन्मे भगवतोदितम् । सङ्ग्रहोऽयं विभूतीनां त्वमेतद्विपुलीकुरु
idaṃ bhāgavataṃ nāma yanme bhagavatoditam | saṅgraho'yaṃ vibhūtīnāṃ tvametadvipulīkuru
SB 2.7.51