Mahabharata 12.335.7

वैशंपायन उवाच · vaiśaṃpāyana uvāca

कथयिष्यामि ते सर्वं पुराणं वेदसंमितम्जगौ यद्भगवान्व्यासो राज्ञो धर्मसुतस्य वै

kathayiṣyāmi te sarvaṃ purāṇaṃ vedasaṃmitamjagau yadbhagavānvyāso rājño dharmasutasya vai

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