Srimad Bhagavatam Canto 07, Chapter 09, Text 06

SB 7.9.6

sa tat-kara-sparsa-dhutakhilasubhah
 sapady abhivyakta-paratma-darsanah
tat-pada-padmam hrdi nirvrto dadhau
 hrsyat-tanuh klinna-hrd-asru-locanah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
By the touch of Lord Nrsimhadeva’s hand on Prahlada Maharaja’s head, Prahlada 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.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
As stated in Bhagavad-gita (14.26):
mam ca yo ’vyabhicarena
 bhakti-yogena sevate
sa gunan samatityaitan
 brahma-bhuyaya kalpate
“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-gita (9.32) the Lord says:
mam hi partha vyapasritya
 ye ’pi syuh papa-yonayah
striyo vaisyas tatha sudras
 te ’pi yanti param gatim
“O son of Prtha, those who take shelter in Me, though they be of lower birth — women, vaisyas [merchants], as well as sudras [workers] — can approach the supreme destination.”
On the strength of these verses from Bhagavad-gita, it is evident that although Prahlada Maharaja 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.
Srimad Bhagavatam Canto 07, Chapter 09, Text 05
Srimad Bhagavatam Canto 07, Chapter 09, Text 07