Srimad Bhagavatam Canto 07, Chapter 01, Text 13

SB 7.1.13

atraivodahrtah purvam
 itihasah surarsina
pritya maha-kratau rajan
 prcchate ’jata-satrave
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Formerly, O King, when Maharaja Yudhisthira was performing the Rajasuya sacrifice, the great sage Narada, responding to his inquiry, recited historical facts showing how the Supreme Personality of Godhead is always impartial, even when killing demons. In this regard he gave a vivid example.
 
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
This relates to how the Lord exhibited His impartiality even when killing Sisupala in the arena of the Rajasuya yajña performed by Maharaja Yudhisthira.
Srimad Bhagavatam Canto 07, Chapter 01, Text 12
Srimad Bhagavatam Canto 07, Chapter 01, Text 14-15