Mbh 1.175.2b

And that virtuous and best of Munis, as soon as he knew this, desirous of benefiting the monarch who was ever observant of vows, addressed him and gave him every assurance. The illustrious Rishi, in the very sight of that monarch, ascended upward to interview Surya, himself possessed of the splendour of that luminary. The Brahmana then approached with joined hands the god of a thousand rays and introduced himself cheerfully unto him, saying, ‘I am Vasishtha.’ Then Vivaswat of great energy said unto that best of Rishis, ‘Welcome art thou, O great Rishi! Tell me what is in thy mind. O thou of great good fortune, whatever thou demandest of me, O foremost of eloquent men, I will confer on thee, however difficult it may be for me!’ Thus addressed by Surya, the Rishi of great ascetic merit, bowing unto the god of light, replied, saying, ‘O Vibhavasu, this thy daughter, Tapati, the younger sister of Savitri, I ask of thee for Samvarana! That monarch is of mighty achievements, conversant with virtue, and of high soul. O firmament-ranger, Samvarana will make a worthy husband for thy daughter.’ Thus addressed by the Rishi Vibhakara, resolved upon bestowing his daughter upon Samvarana, saluted the Rishi, and replied unto him, saying, ‘Oh, Samvarana is the best of monarchs, thou art the best of Rishis, Tapati is the best of women. What should we do, therefore, but bestow her on Samvarana?’ With these words, the god Tapana, made over his daughter, Tapati, of every feature perfectly faultless, unto the illustrious Vasishtha to bestow her upon Samvarana. And the great Rishi then accepted the girl, Tapati, and taking leave of Surya, came back to the spot, where that bull amongst the Kurus, of celestial achievements, was. King Samvarana, possessed by love and with his heart fixed on Tapati, beholding that celestial maiden of sweet smiles led by Vasishtha, became exceedingly glad.