Srimad Bhagavatam Canto 10, Chapter 16, Text 01

SB 10.16.1

sri-suka uvaca
vilokya dusitam krsnam
krsnah krsnahina vibhuh
tasya visuddhim anvicchan
sarpam tam udavasayat
 
Translation: 
 
Sukadeva Gosvami said: Lord Sri Krsna, the Supreme Personality of Godhead, seeing that the Yamuna River had been contaminated by the black snake Kaliya, desired to purify the river, and thus the Lord banished him from it.
 
Srimad Bhagavatam Canto 10, Chapter 16, Text 02