Vyasa said The penances, O worm, of the Kshatriyas consist of the protection of all creatures. Consider these duties of the Kshatriya to be the penances laid down for you. You shall come by the status of a Brahmana.
व्यास उवाच क्षानं देवव्रतं कीट भूतानां परिपालनम्। क्षात्रं देवव्रतं व्यायंस्ततो विप्रत्वमेष्यसि॥