Mahabharata 13.47.29
कस्मात्ते विषमं भागं भजेरन्नृपसत्तमयदा सर्वे त्रयो वर्णास्त्वयोक्ता ब्राह्मणा इति
kasmātte viṣamaṃ bhāgaṃ bhajerannṛpasattamayadā sarve trayo varṇāstvayoktā brāhmaṇā iti
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book