Mahabharata 3.180.39

वैशंपायन उवाच · vaiśaṃpāyana uvāca

तथा वदति वार्ष्णेये धर्मराजे च भारतअथ पश्चात्तपोवृद्धो बहुवर्षसहस्रधृक्प्रत्यदृश्यत धर्मात्मा मार्कण्डेयो महातपाः

tathā vadati vārṣṇeye dharmarāje ca bhārataatha paścāttapovṛddho bahuvarṣasahasradhṛkpratyadṛśyata dharmātmā mārkaṇḍeyo mahātapāḥ

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