Srimad Bhagavatam Canto 07, Chapter 05, Text 02

SB 7.5.2

tau rajña prapitam balam
 prahladam naya-kovidam
pathayam asatuh pathyan
 anyams casura-balakan
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Prahlada Maharaja was already educated in devotional life, but when his father sent him to those two sons of Sukracarya to be educated, they accepted him at their school along with the other sons of the asuras.
Srimad Bhagavatam Canto 07, Chapter 05, Text 01
Srimad Bhagavatam Canto 07, Chapter 05, Text 03