Mahabharata 9.50.2

9.50.2

tatrāpyupaspṛśya balo dattvā dānāni cātmavān |
sārasvatasya dharmātmā munestīrthaṃ jagāma ha || 2 ||

Vaishampayana said, "There, in that tirtha, O Bharata, where the Lord of stars had in former days performed the rajasuya sacrifice, a great battle was fought in which Taraka was the root of the evil. Bathing in that tirtha and making many presents, the virtuous Bala of cleansed soul proceeded to the tirtha of the muni named Sarasvata. There, during a drought extending for twelve years, the sage Sarasvata, in former days, taught the Vedas unto many foremost of brahmanas."