Srimad Bhagavatam Canto 09, Chapter 07, Text 11

SB 9.7.11

nirdase ca sa agatya
 yajasvety aha so ’bravit
dantah pasor yaj jayerann
 atha medhyo bhaved iti
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
After ten days, Varuna came again and said to Hariscandra, “Now you can perform the sacrifice.” Hariscandra replied, “When an animal grows teeth, then it becomes pure enough to be sacrificed.”
Srimad Bhagavatam Canto 09, Chapter 07, Text 10
Srimad Bhagavatam Canto 09, Chapter 07, Text 12