Mahabharata 13.110.1

युधिष्ठिर उवाच · yudhiṣṭhira uvāca

पितामहेन विधिवद्यज्ञाः प्रोक्ता महात्मनागुणाश्चैषां यथातत्त्वं प्रेत्य चेह च सर्वशः

pitāmahena vidhivadyajñāḥ proktā mahātmanāguṇāścaiṣāṃ yathātattvaṃ pretya ceha ca sarvaśaḥ

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