Mahabharata 12.24.2

व्यास उवाच · vyāsa uvāca

अत्राप्युदाहरन्तीममितिहासं पुरातनम्शङ्खश्च लिखितश्चास्तां भ्रातरौ संयतव्रतौ

atrāpyudāharantīmamitihāsaṃ purātanamśaṅkhaśca likhitaścāstāṃ bhrātarau saṃyatavratau

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