Kings should protect the four castes in the discharge of their duties. it is the eternal duty of kings not to allow the confusion of duties of the different orders.
चातुर्वर्ण्यस्य धर्माश्च रक्षितव्या महीक्षिता। धर्मसंकररक्षा च राज्ञां धर्मः सनातनः॥