Mahabharata 12.154.1

युधिष्ठिर उवाच · yudhiṣṭhira uvāca

स्वाध्यायकृतयत्नस्य ब्राह्मणस्य पितामहधर्मकामस्य धर्मात्मन्किं नु श्रेय इहोच्यते

svādhyāyakṛtayatnasya brāhmaṇasya pitāmahadharmakāmasya dharmātmankiṃ nu śreya ihocyate

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