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.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
अथाचार्यसुतस्तेषां बुद्धिमेकान्तसंस्थिताम् । आलक्ष्य भीतस्त्वरितो राज्ञ आवेदयद्यथा
athācāryasutasteṣāṃ buddhimekāntasaṃsthitām | ālakṣya bhītastvarito rājña āvedayadyathā
SB 7.8.2