Srimad-Bhagavatam: Canto 6 - Chapter 1 - Verse 43
Sanskrit:
विद्वेषनष्टमतय: स्त्रियो दारुणचेतस: ।गरं ददु: कुमाराय दुर्मर्षा नृपतिं प्रति ॥ ४३ ॥
ITRANS:
vidveṣa-naṣṭa-matayaḥstriyo dāruṇa-cetasaḥgaraṁ daduḥ kumārāyadurmarṣā nṛpatiṁ prati
Translation:
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.