Srimad Bhagavatam Canto 01, Chapter 17, Text 40

SB 1.17.40

amuni pañca sthanani
hy adharma-prabhavah kalih
auttareyena dattani
nyavasat tan-nidesa-krt
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Thus the personality of Kali, by the directions of Maharaja Pariksit, the son of Uttara, was allowed to live in those five places.
 
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Thus the Age of Kali began with gold standardization, and therefore falsity, intoxication, animal slaughter and prostitution are rampant all over the world, and the saner section is eager to drive out corruption. The counteracting process is suggested above, and everyone can take advantage of this suggestion.
Srimad Bhagavatam Canto 01, Chapter 17, Text 39
Srimad Bhagavatam Canto 01, Chapter 17, Text 41