SB 7.10.24
sri-narada uvaca
prahrado ’pi tatha cakre
pitur yat samparayikam
yathaha bhagavan rajann
abhisikto dvijatibhih
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Sri Narada Muni continued: Thus, as the Supreme Personality of Godhead ordered, Prahlada Maharaja performed the ritualistic ceremonies for his father. O King Yudhisthira, he was then enthroned in the kingdom of Hiranyakasipu, as directed by the brahmanas.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
It is essential that society be divided into four groups of men — brahmanas, ksatriyas, vaisyas and sudras. Here we see that although Prahlada was perfect in every respect, he nonetheless followed the instructions of the brahmanas who performed the Vedic rituals. Therefore in society there must be a very intelligent class of leaders who are well versed in the Vedic knowledge so that they can guide the entire populace to follow the Vedic principles and thus gradually become most perfect and eligible to return home, back to Godhead.