Mahabharata 12.148.13

त्यागधर्मं पवित्राणां संन्यासं परमब्रवीत्अत्राप्युदाहरन्तीमा गाथाः सत्यवता कृताः

tyāgadharmaṃ pavitrāṇāṃ saṃnyāsaṃ paramabravītatrāpyudāharantīmā gāthāḥ satyavatā kṛtāḥ

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