Mahabharata 6.62.38
ब्राह्मणैः क्षत्रियैर्वैश्यैः शूद्रैश्च कृतलक्षणैःसेव्यतेऽभ्यर्च्यते चैव नित्ययुक्तैः स्वकर्मभिः
brāhmaṇaiḥ kṣatriyairvaiśyaiḥ śūdraiśca kṛtalakṣaṇaiḥsevyate'bhyarcyate caiva nityayuktaiḥ svakarmabhiḥ
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book