Mahabharata 3.198.26

3.198.26

bhetavyaṃ hi sadā rājñāṃ prajānāmadhipā hi te |
mārayanti vikarmasthaṃ lubdhā mṛgamiveṣubhiḥ || 26 ||

Service (of the other three orders) hath been ordained to be the duty of the Sudra. Agriculture hath been ordained for the Vaisyas, and fighting for the Kshatriyas, while the practice of the Brahmacharya vow, asceticism, recitation of mantras, and truthfulness have been ordained for the Brahmanas. Over subjects adhering to their proper duties, the king should rule virtuously; while he should set those thereto that have fallen away from the duties of their order. Kings should ever be feared, because they are the lords of their subjects. They restrain those subjects of theirs that fall away from their duties as they restrain the motions of the deer by means of their shafts. O regenerate Rishi, there existeth not in the kingdom of Janaka a single subject that followeth not the duties of his birth. O thou best of the Brahmanas, all the four orders here rigidly adhere to their respective duties. King Janaka punisheth him that is wicked, even if he be his own son; but never doth he inflict pain on him that is virtuous. With good and able spies employed under him, he looketh upon all with impartial eyes. Prosperity, and kingdom, and capacity to punish, belong, O thou best of Brahmanas, to the Kshatriyas. Kings desire high prosperity through practice of the duties that belong to them. The king is the protector of all the four orders. As regards myself, O Brahmana, I always sell pork and buffalo meat without slaying those animals myself.