Long ago this essential anthology of all the Purāṇas was spoken by the infallible Lord Nara-Nārāyaṇa Ṛṣi to Nārada, who then repeated it to Kṛṣṇa Dvaipāyana Vedavyāsa.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
पुराणसंहितामेतामृषिर्नारायणोऽव्ययः । नारदाय पुरा प्राह कृष्णद्वैपायनाय सः
purāṇasaṃhitāmetāmṛṣirnārāyaṇo'vyayaḥ | nāradāya purā prāha kṛṣṇadvaipāyanāya saḥ
SB 12.4.41