Srimad-Bhagavatam: Canto 3 - Chapter 1 - Verse 31


विपन्नान् विषपानेन निगृह्य भुजगाधिपम् ।उत्थाप्यापाययद्गावस्तत्तोयं प्रकृतिस्थितम् ॥ ३१ ॥


vipannān viṣa-pānenanigṛhya bhujagādhipamutthāpyāpāyayad gāvastat toyaṁ prakṛti-sthitam


The inhabitants of Vṛndāvana were perplexed by great difficulties because a certain portion of the Yamunā was poisoned by the chief of the reptiles [Kāliya]. The Lord chastised the snake-king within the water and drove him away, and after coming out of the river, He caused the cows to drink the water and proved that the water was again in its natural state.