Mahabharata 12.186.13

यजुषा संस्कृतं मांसं निवृत्तो मांसभक्षणात्न भक्षयेद्वृथामांसं पृष्ठमांसं च वर्जयेत्

yajuṣā saṃskṛtaṃ māṃsaṃ nivṛtto māṃsabhakṣaṇātna bhakṣayedvṛthāmāṃsaṃ pṛṣṭhamāṃsaṃ ca varjayet

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