Srimad Bhagavatam Canto 10, Chapter 59, Text 37

SB 10.59.37

airavata-kulebhams ca
 catur-dantams tarasvinah
pandurams ca catuh-sastim
 prerayam asa kesavah
 
Translation: 
 
Lord Krsna also dispatched sixty-four swift white elephants, descendants of Airavata, who each sported four tusks.
Srimad Bhagavatam Canto 10, Chapter 59, Text 36
Srimad Bhagavatam Canto 10, Chapter 59, Text 38-39