Mbh 9.42.3a

"Vasishtha said, 'O foremost of rivers, save thyself! O thou of rapid current, bear me away, otherwise Vishvamitra will curse thee. Do not feel any scruple.' Hearing these words of that compassionate Rishi, the river began to think, O Kauravya, as to what course would be best for her to follow. Even these were the thoughts that arose in her mind: 'Vasishtha showeth great compassion for me. It is proper for me that I should serve him.' Beholding then that best of Rishis, (Vasishtha) engaged in silent recitation (of mantras) on her bank, and seeing Kusika's son (Vishvamitra) also engaged in homa, Sarasvati thought, 'Even this is my opportunity.' Then that foremost of rivers, by her current, washed away one of her banks. In washing away that bank, she bore Vasishtha away. While being borne away, O king, Vasishtha praised the river in these words: 'From the Grandsire's (manasa) lake thou hast taken thy rise, O Sarasvati! This whole universe is filled with thy excellent waters! Wending through the firmament, O goddess, thou impartest thy waters to the clouds! All the waters are thee! Through thee we exercise our thinking faculties! Thou art Pushti and Dyuti, Kirti, and Siddhi and Uma! Thou art Speech, and thou art Svaha! This whole universe is dependent on thee! It is thou that dwellest in all creatures, in four forms!' Thus praised by that great Rishi, Sarasvati, O king, speedily bore that Brahmana towards the asylum of Vishvamitra and repeatedly represented unto the latter the arrival of the former. Beholding Vasishtha thus brought before him by Sarasvati, Vishvamitra, filled with rage, began to look for a weapon wherewith to slay that Brahmana. Seeing him filled with wrath, the river from fear of (witnessing and aiding in) a Brahmana's slaughter, quickly bore Vasishtha away to her eastern bank once more. She thus obeyed the words of both, although she deceived the son of Gadhi by her act.