Mahabharata 13.28.6
अत्राप्युदाहरन्तीममितिहासं पुरातनम्मतङ्गस्य च संवादं गर्दभ्याश्च युधिष्ठिर
atrāpyudāharantīmamitihāsaṃ purātanammataṅgasya ca saṃvādaṃ gardabhyāśca yudhiṣṭhira
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book