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Śrīmad-Bhāgavatam
[Canto 7, Ch. 10]
tiṣṭhan:  Rāma, Nṛsiṁha, Varāha and many others are consecutive expansions of the Supreme Personality of Godhead. After Kṛṣṇa comes Balarāma, after Balarāma is Saṅkarṣaṇa, then Aniruddha, Pradyumna, Nārāyaṇa and then the  puruṣa-avatāras —Mahā-Viṣṇu, Garbhodakaśāyī Viṣṇu and Kṣīrodakaśāyī Viṣṇu. All of them are  avatāras .
One must hear about the  avatāras . Narrations about such  avatāras  are called  avatāra-kathā , the narrations of Kṛṣṇa's expansions. Hearing and chanting these narrations is completely pious.  Śrṇvatāṁ sva-kathāḥ kṛṣṇaḥ puṇya-śravaṇa-kīrtanaḥ . One who hears and chants can become  puṇya , purified of material contamination.
Whenever there are references to the  avatāras , religious principles are established, and demons who are against Kṛṣṇa are killed. The Kṛṣṇa consciousness movement is spreading all over the world with two aims—to establish Kṛṣṇa as the Supreme Personality of Godhead and to kill all the pretenders who falsely present themselves as  avatāras . The preachers of the Kṛṣṇa consciousness movement must carry this conviction very carefully within their hearts and kill the demons who in many tactful ways vilify the Supreme Personality of Godhead, Kṛṣṇa. If we take shelter of Nṛsiṁhadeva and Prahlāda Mahārāja, it will be easier to kill the demons who are against Kṛṣṇa and to thus reestablish Kṛṣṇa's supremacy.  Kṛṣṇas tu bhagavān svayam:  Kṛṣṇa is the Supreme Lord, the original Lord. Prahlāda Mahārāja is our  guru , and Kṛṣṇa is our worshipable God. As advised by Śrī Caitanya Mahāprabhu,  guru-kṛṣṇa-prasāde pāya bhakti-latā-bīya . If we can be successful in getting the mercy of Prahlāda Mahārāja and also that of Nṛsiṁhadeva, then our Kṛṣṇa consciousness movement will be extremely successful.
The demon Hiraṇyakaśīpu had so many ways to try to become God himself, but although Prahlāda Mahārāja was chastised and threatened in many ways, he rigidly refused to accept his powerful demoniac father as God. Following in the footsteps of Prahlāda Mahārāja, we should reject all the rascals who pretend to be God. We must accept Kṛṣṇa and His incarnations, and no one else.
TEXTS 43-44
प्रहादस्यानुचरितं महाभागवतस्य च ।  
 मक्तिर्ज्ञानं विरक्तिश्च याथार्थ्यं चास्य वै हरे: ॥४३॥