Mahabharata 13.6.2

भीष्म उवाच · bhīṣma uvāca

अत्राप्युदाहरन्तीममितिहासं पुरातनम्वसिष्ठस्य च संवादं ब्रह्मणश्च युधिष्ठिर

atrāpyudāharantīmamitihāsaṃ purātanamvasiṣṭhasya ca saṃvādaṃ brahmaṇaśca yudhiṣṭhira

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