Mahabharata 13.30.9

ब्राह्मण्यं यदि दुष्प्रापं त्रिभिर्वर्णैः शतक्रतोसुदुर्लभं तदावाप्य नानुतिष्ठन्ति मानवाः

brāhmaṇyaṃ yadi duṣprāpaṃ tribhirvarṇaiḥ śatakratosudurlabhaṃ tadāvāpya nānutiṣṭhanti mānavāḥ

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