Srimad Bhagavatam Canto 09, Chapter 15, Text 14

SB 9.15.14

yam ahur vasudevamsam
 haihayanam kulantakam
trih-sapta-krtvo ya imam
 cakre nihksatriyam mahim
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:  
 
Learned scholars accept this Parasurama as the celebrated incarnation of Vasudeva who annihilated the dynasty of Kartavirya. Parasurama killed all the ksatriyas on earth twenty-one times.
Srimad Bhagavatam Canto 09, Chapter 15, Text 12-13
Srimad Bhagavatam Canto 09, Chapter 15, Text 15