Kural - 549

Abroad to guard, at home to punish, brings
No just reproach; 'tis work assigned to kings

Explanation
68 In guarding his subjects (against injury from others), and in preserving them himself; to punish crime.

Tamil Transliteration
Kutipurang Kaaththompik Kutram Katidhal
Vatuvandru Vendhan Thozhil.