Srimad Bhagavatam Canto 06, Chapter 14, Text 43

SB 6.14.43

vidvesa-nasta-matayah
 striyo daruna-cetasah
garam daduh kumaraya
 durmarsa nrpatim prati
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
As their envy increased, they lost their intelligence. Being extremely hardhearted and unable to tolerate the King’s neglect, they finally administered poison to the son.
Srimad Bhagavatam Canto 06, Chapter 14, Text 42
Srimad Bhagavatam Canto 06, Chapter 14, Text 44