The great sage Parāśara, as aforementioned, being so advised by the great sage Pulastya, spoke unto me the foremost of the Purāṇas [Bhāgavatam]. I shall also describe this before you, my dear son, in terms of my hearing, because you are always my faithful follower.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
प्रोवाच मह्यं स दयालुरुक्तो मुनिः पुलस्त्येन पुराणमाद्यम् । सोऽहं तवैतत्कथयामि वत्स श्रद्धालवे नित्यमनुव्रताय
provāca mahyaṃ sa dayālurukto muniḥ pulastyena purāṇamādyam | so'haṃ tavaitatkathayāmi vatsa śraddhālave nityamanuvratāya
SB 3.8.9