Mahabharata 12.37.14
जातिश्रेण्यधिवासानां कुलधर्मांश्च सर्वतःवर्जयेन्न हि तं धर्मं येषां धर्मो न विद्यते
jātiśreṇyadhivāsānāṃ kuladharmāṃśca sarvataḥvarjayenna hi taṃ dharmaṃ yeṣāṃ dharmo na vidyate
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book