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Śrimad-Bhāgavatam
[Canto 7, Ch. 5]
Śaṇḍa and Amarka, the sons of Śukrācārya in the seminal disciplic succession, were the  gurus  appointed by his father, but his other  guru  was the exalted Nārada Muni, who had instructed Prahlāda when Prahlāda was within the womb of his mother. Prahlāda Mahārāja responded to the inquiry of his father with the instructions he had received from his spiritual master, Nārada. Thus there was again a difference of opinion because Prahlāda Mahārāja wanted to relate the best thing he had learned from his spiritual master, whereas Hiraṇyakaśipu expected to hear about the politics and diplomacy Prahlāda had learned from Śaṇḍa and Amarka. Now the dissension between the father and son became increasingly intense as Prahlāda Mahārāja began to say what he had learned from his  guru  Nārada Muni.
TEXTS 23-24
श्रीप्रह्लाद उवाच
श्रवणं कीर्तनं विष्णोः सरणं पादसेवनम् । 
  अर्चनं वन्दनं दास्यं सख्यमात्मनिवेदनम् ॥२३॥ 
  इति पुंसार्पिता विष्णौ भक्तिश्चेन्नवलक्षणा । 
  क्रियेत भगवत्यद्धा तन्मन्येऽधीतमुत्तमम् ॥२४॥
śrī-prahrāda uvāca 
  śravaṇam kīrtanam viṣṇoḥ 
  smaraṇam pāda-sevanam 
  arcanam vandanam dāsyam 
  sakhyam ātma-nivedanam
iti puṁsārpitā viṣṇau 
  bhaktiś cen nava-lakṣaṇā 
  kriyeta bhagavaty addhā 
  tan manye 'dhītam uttamam
śrī-prahrādaḥ uvāca—Prahlāda Mahārāja said; śravaṇam—hearing; kīrtanam—chanting; viṣṇoḥ—of Lord Viṣṇu (not anyone else); smaraṇam—remembering; pāda-sevanam—serving the feet; arcanam—offering worship (with ṣoḍaśopacāra, the sixteen kinds of