Mahabharata 12.64.6

धर्माश्रमव्यवसिनां ब्राह्मणानां युधिष्ठिरयथा त्रयाणां वर्णानां संख्यातोपश्रुतिः पुराराजधर्मेष्वनुपमा लोक्या सुचरितैरिह

dharmāśramavyavasināṃ brāhmaṇānāṃ yudhiṣṭhirayathā trayāṇāṃ varṇānāṃ saṃkhyātopaśrutiḥ purārājadharmeṣvanupamā lokyā sucaritairiha

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