Mahabharata 1.201.6

कृत्वा दीक्षां गतौ विन्ध्यं तत्रोग्रं तेपतुस्तपःतौ तु दीर्घेण कालेन तपोयुक्तौ बभूवतुः

kṛtvā dīkṣāṃ gatau vindhyaṃ tatrograṃ tepatustapaḥtau tu dīrgheṇa kālena tapoyuktau babhūvatuḥ

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