Śrīmad-Bhāgavatam · Text 1.17.16
Who is speaking and story frame
राज्ञो हि परमो धर्म: स्वधर्मस्थानुपालनम् ।
शासतोऽन्यान् यथाशास्त्रमनापद्युत्पथानिह ॥ १६ ॥
rājño hi paramo dharmaḥ
sva-dharma-sthānupālanam
śāsato ’nyān yathā-śāstram
anāpady utpathān iha
The supreme duty of the ruling king is to give all protection to law-abiding persons and to chastise those who stray from the ordinances of the scriptures in ordinary times, when there is no emergency.
Read Śrīla Prabhupāda's purport on Vedabase.io