He assailed me with weapons—he had me thrown into fire, bitten by the serpents, had poison mixed up with my viands, had me cast into the deep in bonds, and buried down with rocks and many other ills he had wrought against me out of malice for being devoted unto thee. May my father, O lord, by thy mercy, be speedily relieved of the sin he hath thus committed". The Deity replied,—"Prahlāda, all this shall be accomplished by my mercy. I wish to confer upon thee another boon, O son of Asura, do thou beg it".
In plain words: Prahlada lists what his father did to him: attacked him with weapons, threw him in fire, had snakes bite him, poisoned his food, and threw him tied up into the sea under rocks. Still, he asks Vishnu to free his father from the guilt of these acts. Vishnu agrees and offers him yet another wish.