Srimad-Bhagavatam: Canto 7 - Chapter 1 - Verse 2
Sanskrit:
तौ राज्ञा प्रापितं बालं प्रह्लादं नयकोविदम् ।पाठयामासतु: पाठ्यानन्यांश्चासुरबालकान् ॥ २ ॥
ITRANS:
tau rājñā prāpitaṁ bālaṁprahlādaṁ naya-kovidampāṭhayām āsatuḥ pāṭhyānanyāṁś cāsura-bālakān
Translation:
Prahlāda Mahārāja was already educated in devotional life, but when his father sent him to those two sons of Śukrācārya to be educated, they accepted him at their school along with the other sons of the asuras.