Srimad Bhagavatam Canto 04, Chapter 11, Text 08

SB 4.11.8

nasmat-kulocitam tata
karmaitat sad-vigarhitam
vadho yad upadevanam
arabdhas te ’krtainasam
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
My dear son, the killing of the sinless Yaksas which you have undertaken is not at all approved by authorities, and it does not befit our family, which is supposed to know the laws of religion and irreligion.
Srimad Bhagavatam Canto 04, Chapter 11, Text 07
Srimad Bhagavatam Canto 04, Chapter 11, Text 09