Vishnu Puran 27 (with English subtitle)

On hearing that Prahlad escaped once again Hiranyakashyapu chases Swarbhanu in anger blaming for the cause. Then comes Hiranyakashyapu's sister Sinhika and her husband Viprachitti to meet him. She has got a boon from fire god that she can enter fire and still remain unconsumed. She shows this miracle to all people of palace. On hearing about Prahlad's Vishnu devotion, she tries to convince him and then wants him to be killed. She sends him with a letter to her son.