Srimad Bhagavatam Canto 10, Chapter 36, Text 15

SB 10.36.15

evam kukudminam hatva
 stuyamanah dvijatibhih
vivesa gostham sa-balo
 gopinam nayanotsavah
 
Translation: 
 
Having thus killed the bull demon Arista, He who is a festival for the gopis’ eyes entered the cowherd village with Balarama.
 
Purport: 
 
This verse exemplifies the sublime contrast of spiritual qualities within Sri Krsna. In one four-line verse we simultaneously learn that Lord Krsna killed a powerful and wicked demon and that His boyish beauty gave festive pleasure to His young girlfriends. Lord Krsna is as hard as a thunderbolt or as soft as a rose, depending on our attitude toward Him. The demon Arista wanted to kill Krsna and all His friends, so the Lord beat him into a wet rag and killed him. The gopis, however, loved Krsna, and thus the Lord boyishly reciprocated their conjugal feelings.
Srimad Bhagavatam Canto 10, Chapter 36, Text 14
Srimad Bhagavatam Canto 10, Chapter 36, Text 16