Mahabharata 1.150.2

आकारेणैव तं ज्ञात्वा पाण्डुपुत्रो युधिष्ठिरःरहः समुपविश्यैकस्ततः पप्रच्छ मातरम्

ākāreṇaiva taṃ jñātvā pāṇḍuputro yudhiṣṭhiraḥrahaḥ samupaviśyaikastataḥ papraccha mātaram

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