The Great Epic of the Bhārata dynasty 9.39.21

9.39.21

tathoktā sāsṛjaddhenuḥ puruṣānghoradarśanān |
te ca tadbalamāsādya babhañjuḥ sarvatodiśam || 21 ||

There was a great Kshatriya, celebrated over the world, known by the name of Gadhi. He had a son born to him, of the name of Vishvamitra of great prowess. King Kausika became a great ascetic. Possessed of great ascetic merit, he wished to install his son Vishvamitra on his throne, himself having resolved to cast off his body. His subjects, bowing unto him, said, 'Thou shouldst not go away, O thou of great wisdom, but do thou protect us from a great fear!' Thus addressed, Gadhi replied unto his subjects, saying, 'My son will become the protector of the wide universe!' Having said these words, and placed Vishvamitra (on the throne), Gadhi, O king, went to heaven, and Vishvamitra became king. He could not, however, protect the earth with even his best exertions. The king then heard of the existence of a great fear of Rakshasas (in his kingdom). With his four kinds of forces, he went out of his capital. Having proceeded far on his way, he reached the asylum of Vasishtha. His troops, O king, caused much mischief there. The adorable Brahmana Vasishtha, when he came to his asylum, saw the extensive woods in course of destruction. That best of Rishis, Vasishtha, O king, became angry, O monarch, with Vishvamitra. He commanded his own (homa) cow, saying, 'Create a number of terrible Savaras!' Thus addressed, the cow created a swarm of men of frightful visages. These encountered the army of Vishvamitra and began to cause a great carnage everywhere. Seeing this, his troops fled away.