Mbh 3.82.5e

Proceeding next to Vitasta and giving oblations of water unto the Pitris and the gods, a man, O Bharata, obtaineth the fruit of the Vajapeya sacrifice. That sin-destroying tirtha known by the name of Vitasta, is situate in the country of the Kasmiras and is the abode of the Naga Takshaka. Bathing there, a man certainly obtaineth the fruit of the Vajapeya sacrifice, and his soul cleansed from every sin, he attaineth to a high state of blessedness. One should next proceed to Vadava celebrated over the three worlds. Bathing there with due rites in the evening, one should offer rice boiled in butter and milk, according to the best of his might, unto the deity of seven flames. Men of wisdom say that a gift made here in honour of the Pitris, becometh inexhaustible. The Rishis, the Pitris, the gods, the Gandharvas, several tribes of Apsaras, the Guhyakas, the Kinnaras, the Yakshas, the Siddhas, the Vidhyadharas, the Rakshasas, Daityas, Rudras, and Brahma himself, O king, having with subdued senses, accepted a course of austerities for a thousand years in order to move Vishnu to grace, cooked rice in milk and butter and gratified Kesava with oblations, each offered with seven Riks. And, O king, the gratified Kesava thereupon conferred on them the eight-fold attributes called Aiswarya and other objects that they desired. And having bestowed upon them these, that god disappeared in their sight like lightning in the clouds. And it is for this, O Bharata, that that tirtha became known by the name of Saptacharu, and if one offereth Charu there to the seven flamed deity, he obtaineth merit superior to that of the gift of a hundred thousand kine, to that of a hundred Rajasuya sacrifices, as also of a hundred horse-sacrifices. Leaving Vadava, O king, one should then proceed to Raudrapada, and beholding Mahadeva there one obtaineth the merit of the horse-sacrifice.