Srimad-Bhagavatam: Canto 7 - Chapter 1 - Verse 6
स तत्करस्पर्शधुताखिलाशुभ:सपद्यभिव्यक्तपरात्मदर्शन: ।तत्पादपद्मं हृदि निर्वृतो दधौहृष्यत्तनु: क्लिन्नहृदश्रुलोचन: ॥ ६ ॥
sa tat-kara-sparśa-dhutākhilāśubhaḥsapady abhivyakta-parātma-darśanaḥtat-pāda-padmaṁ hṛdi nirvṛto dadhauhṛṣyat-tanuḥ klinna-hṛd-aśru-locanaḥ
By the touch of Lord Nṛsiṁhadeva’s hand on Prahlāda Mahārāja’s head, Prahlāda was completely freed of all material contaminations and desires, as if he had been thoroughly cleansed. Therefore he at once became transcendentally situated, and all the symptoms of ecstasy became manifest in his body. His heart filled with love, and his eyes with tears, and thus he was able to completely capture the lotus feet of the Lord within the core of his heart.
As stated in Bhagavad-gītā (14.26): “One who engages in full devotional service, who does not fall down in any circumstance, at once transcends the modes of material nature and thus comes to the level of Brahman.” Elsewhere in Bhagavad-gītā (9.32) the Lord says: “O son of Pṛthā, those who take shelter in Me, though they be of lower birth — women, vaiśyas [merchants], as well as śūdras [workers] — can approach the supreme destination.” On the strength of these verses from Bhagavad-gītā, it is evident that although Prahlāda Mahārāja was born in a demoniac family and although virtually demoniac blood flowed within his body, he was cleansed of all material bodily contamination because of his exalted position as a devotee. In other words, such impediments on the spiritual path could not stop him from progressing, for he was directly in touch with the Supreme Personality of Godhead. Those who are physically and mentally contaminated by atheism cannot be situated on the transcendental platform, but as soon as one is freed from material contamination he is immediately fit to be situated in devotional service.