Mahabharata 7.169.39

दुर्ज्ञेयः परमो धर्मस्तथाधर्मः सुदुर्विदःयुध्यस्व कौरवैः सार्धं मा गाः पितृनिवेशनम्

durjñeyaḥ paramo dharmastathādharmaḥ sudurvidaḥyudhyasva kauravaiḥ sārdhaṃ mā gāḥ pitṛniveśanam

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