Srimad Bhagavatam Canto 09, Chapter 07, Text 13

SB 9.7.13

pasor nipatita danta
 yajasvety aha so ’bravit
yada pasoh punar danta
 jayante ’tha pasuh sucih
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
When the teeth had fallen out, Varuna returned and said to Hariscandra, “Now the animal’s teeth have fallen out, and you can perform the sacrifice.” But Hariscandra replied, “When the animal’s teeth grow in again, then he will be pure enough to be sacrificed.”
Srimad Bhagavatam Canto 09, Chapter 07, Text 12
Srimad Bhagavatam Canto 09, Chapter 07, Text 14