Srimad-Bhagavatam: Canto 7 - Chapter 1 - Verse 18
Sanskrit:
दमघोषसुत: पाप आरभ्य कलभाषणात् ।सम्प्रत्यमर्षी गोविन्दे दन्तवक्रश्च दुर्मति: ॥ १८ ॥
ITRANS:
damaghoṣa-sutaḥ pāpaārabhya kala-bhāṣaṇātsampraty amarṣī govindedantavakraś ca durmatiḥ
Translation:
From the very beginning of his childhood, when he could not even speak properly, Śiśupāla, the most sinful son of Damaghoṣa, began blaspheming the Lord, and he continued to be envious of Śrī Kṛṣṇa until death. Similarly, his brother Dantavakra continued the same habits.