Mahabharata 13.40.2

अत्र ते वर्तयिष्यामि इतिहासं पुरातनम्यथा रक्षा कृता पूर्वं विपुलेन महात्मना

atra te vartayiṣyāmi itihāsaṃ purātanamyathā rakṣā kṛtā pūrvaṃ vipulena mahātmanā

Our plain-language meaning of this verse is waiting for scholar review.