Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 53
दुर्योधनमृते पापं कलिं कुरुकुलामयम् ।यो न सेहे श्रियं स्फीतां दृष्ट्वा पाण्डुसुतस्य ताम् ॥ ५३ ॥
duryodhanam ṛte pāpaṁkaliṁ kuru-kulāmayamyo na sehe śrīyaṁ sphītāṁdṛṣṭvā pāṇḍu-sutasya tām
[All were satisfied] except sinful Duryodhana, the personification of the age of quarrel and the disease of the Kuru dynasty. He could not bear to see the flourishing opulence of the son of Pāṇḍu.
Śrīla Prabhupāda writes: “Duryodhana by nature was very envious because of his sinful life, and he appeared in the dynasty of the Kurus as a chronic disease personified in order to destroy the whole family.” Śrīla Śrīdhara Svāmī mentions that Duryodhana hated pure religious principles.