The story of Holika burning

Hiranyakashipu goes to meet his sister "Holika". Holika comes out of a pyre and asks her brother about his reason of visit. Hiranyakashipu tells her about the person she has to kill and she wonders who he couldn't defeat? When the king answers that it is his son that she is to kill, Holika demands an explanation. In the end, Holika agrees to kill Prahlad who still doesn't abide by his father's rules and is ready to sit on a pyre with Holika.