Mbh 5.106.3a

Vaisampayana continued, “Narada said, ‘Persons that listen to the counsels of friends are rare. Friends again are rare that offer beneficial counsels, for a friend (in need of counsel) is never there where a friend (offering counsel) is. O son of Kuru’s race, I think, the word of friends ought to be listened to. Obstinacy ought to be avoided; for it is fraught with great evil. In this connection is cited an old story regarding Galava’s having met with disgrace through obstinacy. In ancient times, in order to test Viswamitra, who was then engaged in ascetic austerities. Dharma personally came to him, having assumed the form of the Rishi, Vasishtha. Thus assuming, O Bharata, the form of the one of the seven Rishis, and feigning himself hungry and desirous of eating, he came, O king, to the hermitage of Kausika. Thereupon, Viswamitra struck with awe, began to cook Charu (which was a preparation of rice and milk). And in consequence of the care he took in preparing that excellent food, he could not properly wait upon his guest. And it was not till after the guest had dined on the food offered by the other hermits that Viswamitra succeeded in approaching him with the Charu he had cooked and which was still steaming. “I have already dined; wait here,”--were the words that the holy one said. And having said that the holy one went away. And thereupon, the illustrious Viswamitra, O king, waited there. And bearing that food on his head and holding it with his arms, that ascetic of rigid vow stood in his hermitage, still as a post, subsisting on air. And as he stood there, an ascetic of the name of Galava, from motives of respect and reverence and from affection and desire of doing what was agreeable, began to wait upon him. And after a hundred years had passed away, Dharma, again assuming the form of Vasishtha, came to Kausika from desire of eating.