Mahabharata 12.75.2

12.75.2

yatādṛṣṭaṃ bhayaṃ brahma prajānāṃ śamayatyuta |
dṛṣṭaṃ ca rājā bāhubhyāṃ tadrāṣṭraṃ sukhamedhate || 2 ||

"Bhishma said, 'It is said that the preservation and growth of the kingdom rest upon the king. The preservation and growth of the king rest upon the king's priest. That kingdom enjoys true felicity where the invisible fears of the subjects are dispelled by the Brahmana and all visible fears are dispelled by the king with the might of his arms. In this connection is cited the old narrative of the discourse between king Muchukunda and Vaisravana. King Muchukunda, having subjugated the whole earth, repaired to the lord of Alaka for testing his strength. King Vaisravana created (by ascetic power) a large force of Rakshasas. These ground the forces led by Muchukunda. Beholding the slaughter of his army, king Muchukunda, O chastiser of foes, began to rebuke his own learned priest (Vasishtha). Thereupon that foremost of righteous persons viz., Vasishtha, underwent very severe penances and, causing those Rakshasas to be slain, ascertained the true course upon which Muchukunda was bent. When king Vaisravana's troops were being slaughtered, he showed himself unto Muchukunda and said these words.'