Srimad Bhagavatam Canto 10, Chapter 66, Text 42

SB 10.66.42

dagdhva varanasim sarvam
 visnos cakram sudarsanam
bhuyah parsvam upatisthat
 krsnasyaklista-karmanah
 
Translation: 
 
After burning down the entire city of Varanasi, Lord Visnu’s Sudarsana cakra returned to the side of Sri Krsna, whose actions are effortless.
Srimad Bhagavatam Canto 10, Chapter 66, Text 41
Srimad Bhagavatam Canto 10, Chapter 66, Text 43