Mahabharata 12.194.2

भीष्म उवाच · bhīṣma uvāca

अत्राप्युदाहरन्तीममितिहासं पुरातनम्मनोः प्रजापतेर्वादं महर्षेश्च बृहस्पतेः

atrāpyudāharantīmamitihāsaṃ purātanammanoḥ prajāpatervādaṃ maharṣeśca bṛhaspateḥ

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