Śrīmad-Bhāgavatam · Text 7.8.2
Who is speaking and story frame
अथाचार्यसुतस्तेषां बुद्धिमेकान्तसंस्थिताम् ।
आलक्ष्य भीतस्त्वरितो राज्ञ आवेदयद्यथा ॥ २ ॥
athācārya-sutas teṣāṁ
buddhim ekānta-saṁsthitām
ālakṣya bhītas tvarito
rājña āvedayad yathā
When Ṣaṇḍa and Amarka, the sons of Śukrācārya, observed that all the students, the sons of the demons, were becoming advanced in Kṛṣṇa consciousness because of the association of Prahlāda Mahārāja, they were afraid. They approached the King of the demons and described the situation as it was.
Read Śrīla Prabhupāda's purport on Vedabase.io