Bhagavatapurana 5.4.16

5.4.16

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yadyapi sva-viditaṃ sakala-dharmaṃ brāhmaṃ guhyaṃ brāhmaṇair darśita-mārgeṇa sāmādibhir upāyair janatām anuśaśāsa //

16. Though he was himself aware of all the righteous courses treasured in the Vedas, still he followed the path pointed out by Brahmanas and governed his people by a judicious use of the four expedients of peace, gifts, discord and war.