Mbh 9.41.1a

Vaishampayana said, "The delighter of the Yadus then proceeded to the asylum (of Vaka) which resounded with the chanting of the Vedas. There the great ascetic, O king, named Dalvyavaka poured the kingdom of Dhritarashtra, the son of Vichitravirya, as a libation (on the sacrificial fire). By practising very austere penances he emaciated his own body. Endued with great energy, the virtuous Rishi, filled with great wrath, (did that act). In former times, the Rishis residing in the Naimisha forest had performed a sacrifice extending for twelve years. In course of that sacrifice, after a particular one called Viswajit had been completed, the Rishis set out for the country of the Pancalas. Arrived there, they solicited the king for giving them one and twenty strong and healthy calves to be given away as Dakshina (in the sacrifice they have completed). Dalvya Vaka, however, (calling those Rishis), said unto them, 'Do you divide those animals (of mine) among you! Giving away these (unto you), I shall solicit a great king (for some).' Having said so unto all those Rishis, Vaka of great energy, that best of Brahmanas, then proceeded to the abode of Dhritarashtra. Arrived at the presence of king Dhritarashtra, Dalvya begged some animals of him. That best of kings, however, seeing that some of his kine died without any cause, angrily said unto him. 'Wretch of a Brahmana, take, if thou likest, these animals that (are dead)!' Hearing these words, the Rishi, conversant with duties, thought, 'Alas, cruel are the words that have been addressed to me in the assembly!' Having reflected in this strain, that best of Brahmanas, filled with wrath, set his heart upon the destruction of king Dhritarashtra. Cutting the flesh from off the dead animals, that best of sages, having ignited a (sacrificial) fire on the tirtha of the Sarasvati, poured those pieces as libations for the destruction of king Dhritarashtra's kingdom.