Mahabharata 1.138.21
त्रिषु लोकेषु यद्राज्यं धर्मविद्योऽर्हते नृपःसोऽयं भूमौ परिश्रान्तः शेते प्राकृतवत्कथम्
triṣu lokeṣu yadrājyaṃ dharmavidyo'rhate nṛpaḥso'yaṃ bhūmau pariśrāntaḥ śete prākṛtavatkatham
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book