Hiranyakashipu said—"O serpents, speedily bring this vicious lad to destruction with your envenomed fangs". Parāçara said:—Being thus commanded by him, Kuhaka, Takshaka, Artdhaka and many other venomous serpents, bit him in every part of his body. But with his mind solely devoted to Krishna he remained in that pleasurable recollection; he could not feel anything although he was bitten by deadliest serpents.
In plain words: The demon king Hiranyakashipu orders deadly snakes to kill his son Prahlada. The snakes bite him all over, but Prahlada keeps his mind happily fixed on Krishna (Vishnu) and feels nothing.