SB 12.6.27

tasmāt satram idaṁ rājan
 saṁsthīyetābhicārikam
sarpā anāgaso dagdhā
 janair diṣṭaṁ hi bhujyate
Synonyms: 
tasmāt — therefore; satram — sacrifice; idam — this; rājan — O King; saṁsthīyeta — should be stopped; ābhicārikam — done with intent to harm; sarpāḥ — the serpents; anāgasaḥ — innocent; dagdhāḥ — burned; janaiḥ — by persons; diṣṭam — fate; hi — indeed; bhujyate — is suffered.
Translation: 
Therefore, my dear King, please stop this sacrificial performance, which was initiated with the intent of doing harm to others. Many innocent snakes have already been burned to death. Indeed, all persons must suffer the unforeseen consequences of their past activities.
Purport: 

Bṛhaspati here admits that although the snakes appeared to be innocent, by the Lord’s arrangement they were also being punished for previous vicious activities.