Srimad Bhagavatam Canto 10, Chapter 66, Text 21

SB 10.66.21

iti ksiptva sitair banair
 virathi-krtya paundrakam
siro ’vrscad rathangena
 vajrenendro yatha gireh
 
Translation: 
 
Having thus derided Paundraka, Lord Krsna destroyed his chariot with His sharp arrows. The Lord then cut off his head with the Sudarsana disc, just as Lord Indra lops off a mountain peak with his thunderbolt weapon.
Srimad Bhagavatam Canto 10, Chapter 66, Text 20
Srimad Bhagavatam Canto 10, Chapter 66, Text 22