Mahabharata 3.149.35

याजनाध्यापने चोभे ब्राह्मणानां प्रतिग्रहःपालनं क्षत्रियाणां वै वैश्यधर्मश्च पोषणम्

yājanādhyāpane cobhe brāhmaṇānāṃ pratigrahaḥpālanaṃ kṣatriyāṇāṃ vai vaiśyadharmaśca poṣaṇam

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