Mbh 5.189.1c

Proceeding next (one after another) to the asylum, O king, of Narada, and to the auspicious asylum of Uluka and to that of Chyavana, and to the spot sacred to Brahmana, and to Prayaga the sacrificial platform of the gods, and to that forest sacred to the gods, and to Bhogawati, and, O monarch, to the asylum of Kusika’s son (Viswamitra), and to the asylum of Mandavya, and also to the asylum of Dwilipa, and to Ramhrada, and, O Kaurava, to the asylum of Garga, the princess of Kasi, O king, performed ablutions in the sacred waters of all these, observing all the while the most difficult of vows. One day, my mother from the waters asked her, O Kauravya, saying, ‘O blessed lady, for what dost thou afflict thyself so? Tell me the truth!’ Thus asked, O monarch, that faultless damsel answered her with joined hands, saying, ‘O thou of handsome eyes, Rama hath been vanquished in battle by Bhishma. What other (Kshatriya) king then would venture to defeat the latter when ready with his weapons? As regards myself, I am practising the severest penances for the destruction of Bhishma. I wander over the earth, O goddess, so that I may slay that king! In every thing I do, O goddess, even this is the great end of my vows!’ Hearing these words of hers, the Ocean-going (river Ganga) replied unto her, saying, ‘O lady, thou art acting crookedly! O weak girl, this wish of thine thou shalt not be able to achieve, O faultless one. If, O princess of Kasi, thou observest these vows for destruction of Bhishma, and if thou takest leave of thy body while observing them, thou shalt (in thy next birth) become a river, crooked in her course and of water only during the rains! All the bathing places along thy course will be difficult of approach, and filled only during the rains, thou shalt be dry for eight months (during the year)! Full of terrible alligators, and creatures of frightful mien thou shalt inspire fear in all creatures!’