Hiranyakashipu was the most powerful demon king in all creation. Having performed great tapas, he received a boon making him nearly immortal — he could not be killed by man or beast, inside or outside, by day or night, on earth or in sky, by any weapon. With this power, he declared himself God and banned all worship of Vishnu.
Yet his own son, young Prahlada, refused to obey. From birth, Prahlada's every breath was filled with the name of Vishnu. He worshipped, chanted, and lived in absolute devotion — not from fear, but from pure love.
Hiranyakashipu tried everything. He had Prahlada thrown off cliffs — Vishnu caught him. Trampled by elephants — the elephants bowed. Thrown into serpent pits — the serpents became soft as flowers. Burned in fire alongside his aunt Holika, who had a boon of fire protection — yet Prahlada sat in the flames untouched while Holika burned. This event is remembered as Holika Dahan, celebrated before Holi.
Finally, Hiranyakashipu pointed to a pillar: “Is your Vishnu in this pillar too?” Prahlada calmly replied, “He is in every atom of creation.” The demon struck the pillar. It exploded — and from within emerged Narasimha, the fourth avatar of Vishnu — half man, half lion. He held Hiranyakashipu on his lap at the threshold of the palace at twilight and tore him apart with bare claws. Every condition of the boon was perfectly honoured — the great protector had appeared.