I have heard from you this Śrīmad-Bhāgavatam, which is the perfect summary of all the Purāṇas and which perfectly describes the Supreme Lord, Uttamaḥśloka.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
पुराणसंहितामेतामश्रौष्म भवतो वयम् । यस्यां खलूत्तमश्लोको भगवाननुवर्ण्यते
purāṇasaṃhitāmetāmaśrauṣma bhavato vayam | yasyāṃ khalūttamaśloko bhagavānanuvarṇyate
SB 12.6.4