Although King Indra and the other demigods are exalted personalities, they were so obedient to Narada Muni that King Indra immediately accepted Narada Muni's words concerning Prahlada Maharaja. This is called understanding by the parampara system
SB Canto 7
When the great saint Nārada Muni had thus spoken, King Indra, being respectful to Nārada's words, immediately released my mother. Because of my being a devotee of the Lord, all the demigods circumambulated her. Then they returned to their celestial kingdom.
Although King Indra and the other demigods are exalted personalities, they were so obedient to Nārada Muni that King Indra immediately accepted Nārada Muni's words concerning Prahlāda Mahārāja. This is called understanding by the paramparā system. Indra and the demigods did not know that a great devotee was in the womb of Kayādhu, the wife of Hiraṇyakaśipu, but they accepted the authoritative statements of Nārada Muni and immediately offered their respects to the devotee by circumambulating the woman in whose womb he was living. To understand God and the devotee by the paramparā system is the process of knowledge. There is no need to speculate about God and His devotee. One should accept the statements of a bona fide devotee and thus try to understand.