Mahabharata 13.70.2
भीष्म उवाच · bhīṣma uvāca
अत्राप्युदाहरन्तीममितिहासं पुरातनम्ऋषेरुद्दालकेर्वाक्यं नाचिकेतस्य चोभयोः
atrāpyudāharantīmamitihāsaṃ purātanamṛṣeruddālakervākyaṃ nāciketasya cobhayoḥ
Our plain-language meaning of this verse is waiting for scholar review.