Vishnupurana 3.8.p4

3.8.p4

"The duties of the Kshatriyas consist in making gifts to the Brahmins at pleasure, in worshipping Vishnu with various sacrifices and receiving instructions from the preceptor. His principal sources of maintenance are arms and protection of the earth. But his greatest duty consists in guarding the earth. By protecting the earth a king attains his objects; for he gets a share of the merit of all sacrifices. If a king, by maintaining the order of caste, represses the wicked, supports the pious he proceeds to whatever region he desires.