18 Attempts to kill Prahlada by his father Hiranyakashipu… Hiranyakashipu had made 18 attempts to kill Prahlada, his own son. This story is mentioned in Vishnu Purana..
When the demons saw that their all efforts failed to faze Prahlada and that he was preaching the demon children they informed Hiranyakashipu about all these happenings. Hiranyakashipu at once called his cook and ordered him to poison Prahlada through food. But the poisonous food also could not hurt Prahlada. In fact, its poison was rendered ineffective by the recitation of Lord’s name. This frightened the cook. He informed Hiranyakashipu about that miraculous event.
Hiranyakashipu then ordered the priests who were Prahlada’s teachers to invoke the ogress Kritya in order to kill Prahlada. The teachers tried to convince Prahlada before invoking Kritya. “O prince, you are the son of great Hiranyakashipu and have taken birth in Brahma’s lineage. What have you to do with matters like God and all that? The whole world is dependent on your father. You should also take refuge of your father and stop praising his opponent. Father is revered and even greater than the teachers.”
Prahlada said-“O fortunate ones! I know the prowess of my father. I also do not doubt regarding my father’s reverence and greatness. I will not commit any crime against him but kindly listen to me what I mean by the endless God.”
“O teachers! There are four attainable goals in one’s life. You ask me what have I to do with He, who helps all the human beings to attain these four goals- Dharma, Artha, Kama and Moksha. You are my teachers. You are free to say anything to me. But within me stays He who is the creator of all, who is the preserver of all and who is the destroyer of all of us. Kindly forgive me if I have committed any thing wrong in your honor.”
The teachers said-“O foolish boy, we saved you from imminent death thinking that you are our disciple and that you will not balderdash in future. But still you speak nonsense. Listen, if you don’t drop your stubbornness we’ll have to invoke Kritya the ogress in order to get you slain.”
Unfazed Prahlada said that life and death were immaterial for the soul that protects or destroys itself through auspicious and inauspicious deeds. Hence one should always strive to behave in an auspicious way. But Prahlada’s words further enraged his teachers. They invoked the ogress Kritya to get Prahlada slain. Kritya hit Prahlada’s chest hard with her trident. But as soon as the trident touched his chest it broke into pieces without harming Prahlada.
Seeing her attempt failed, Kritya killed the teachers and disappeared. His teachers’ death caused immense pain for Prahlada. Mourning for their death, he prayed Lord Vishnu to resurrect them. Hearing his prayers, Lord Vishnu once again granted life to his teachers. The teachers got up as if from a deep slumber. They realised their mistake and blessed Prahlada and resolved never to have hostility against him. Then they went to the palace and informed Hiranyakashipu about all the happenings.