Srimad-Bhagavatam: Canto 7 - Chapter 1 - Verse 33
Sanskrit:
मातृष्वस्रेयो वश्चैद्यो दन्तवक्रश्च पाण्डव ।पार्षदप्रवरौ विष्णोर्विप्रशापात्पदच्युतौ ॥ ३३ ॥
ITRANS:
mātṛ-ṣvasreyo vaś caidyodantavakraś ca pāṇḍavapārṣada-pravarau viṣṇorvipra-śāpāt pada-cyutau
Translation:
Nārada Muni continued: O best of the Pāṇḍavas, your two cousins Śiśupāla and Dantavakra, the sons of your maternal aunt, were formerly associates of Lord Viṣṇu, but because they were cursed by brāhmaṇas, they fell from Vaikuṇṭha to this material world.
Purport:
Śiśupāla and Dantavakra were not ordinary demons, but were formerly personal associates of Lord Viṣṇu. They apparently fell to this material world, but actually they came to assist the Supreme Personality of Godhead by nourishing His pastimes within this world.