Mahabharata 12.74.2

12.74.2

dharmātmā dharmavidyeṣāṃ rājñāṃ rājanpurohitaḥ |
rājā caivaṃguṇo yeṣāṃ kuśalaṃ teṣu sarvaśaḥ || 2 ||

"Bhishma said, 'The king, with an eye to both religious merit and profit whose considerations are often very intricate, should, without delay, appoint a priest possessed of learning and intimate acquaintance with the Vedas and the (other) scriptures. Those kings that have priests possessed of virtuous souls and conversant with policy, and that are themselves possessed of such attributes, enjoy prosperity in every direction. Both the priest and the king should have such qualities as are worthy of regard and should be observant of vows and penances. They would then succeed in supporting and aggrandising the subjects and the deities, the Pitris and the children. It is laid down that they should be possessed of similar hearts and should be each other's friends. In consequence of such friendship between Brahmana and Kshatriya, the subjects become happy. If they do not regard each other, destruction would overtake the people. The Brahmana and the Kshatriya are said to be the progenitors of all men. In this connection is cited the old story about the discourse between Aila's son and Kasyapa. Listen to it, O Yudhishthira.'