The Great Epic of the Bhārata dynasty 1.49.4

1.49.4

sūta uvāca |
tata ācaṣṭa sā tasmai bāndhavānāṃ hitaiṣiṇī |
bhaginī nāgarājasya jaratkāruraviklavā || 4 ||

"Then Jaratkaru, the sister of the king of the snakes, herself unmoved by the general distress, and even desirous of the welfare of her relatives, said unto him, 'O son, it is said that the mother of all the snakes is Kadru. Know thou why she cursed in anger her sons.' Addressing the snakes she said, 'As ye have refused to falsely represent Uchchaihsravas, the prince of horses, for bringing about Vinata's bondage according to the wager, therefore, shall he whose charioteer is Vayu burn you all in Janamejaya's sacrifice. And perishing in that sacrifice, ye shall go to the region of the unredeemed spirits.' The Grandsire of all the worlds spake unto her while uttering this curse, 'Be it so,' and thus approved of her speech. Vasuki, having heard that curse and then the words of the Grandsire, sought the protection of the gods, O child, on the occasion when the amrita was being churned for. And the gods, their object fulfilled, for they had obtained the excellent amrita, with Vasuki ahead, approached the Grandsire. And all the gods, with king Vasuki, sought to incline Him who was born of the lotus to be propitious, so that the curse might be made abortive.'