Mahabharata 12.76.11

सर्ववर्णैः सदा रक्ष्यं ब्रह्मस्वं ब्राह्मणास्तथान स्थेयं विषये तेषु योऽपकुर्याद्द्विजातिषु

sarvavarṇaiḥ sadā rakṣyaṃ brahmasvaṃ brāhmaṇāstathāna stheyaṃ viṣaye teṣu yo'pakuryāddvijātiṣu

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