Shiva Purana
यदर्थमवतारोऽयं निहतस्स हि दानवः ॥ हिरण्यकशिपुश्चैव प्रह्लादोऽपि सुरक्षितः ॥ २३॥
That Dānava Hiraṇyakaśipu has been killed for which purpose you have taken this incarnation. Prahlāda too has been saved.
english translation
yadarthamavatAro'yaM nihatassa hi dAnavaH ॥ hiraNyakazipuzcaiva prahlAdo'pi surakSitaH ॥ 23॥
hk transliteration by Sanscript