Mahabharata 13.112.9

युधिष्ठिर उवाच · yudhiṣṭhira uvāca

भगवन्सर्वधर्मज्ञ सर्वशास्त्रविशारदमर्त्यस्य कः सहायो वै पिता माता सुतो गुरुः

bhagavansarvadharmajña sarvaśāstraviśāradamartyasya kaḥ sahāyo vai pitā mātā suto guruḥ

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