Mahabharata 1.2.105

अतः परं तृतीयं तु ज्ञेयमारण्यकं महत्पौरानुगमनं चैव धर्मपुत्रस्य धीमतः

ataḥ paraṃ tṛtīyaṃ tu jñeyamāraṇyakaṃ mahatpaurānugamanaṃ caiva dharmaputrasya dhīmataḥ

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