My dear King Yudhiṣṭhira, when all the attempts of the demons to kill Prahlāda Mahārāja were futile, the King of the demons, Hiraṇyakaśipu, being most fearful, began contriving other means to kill him.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
प्रयासेऽपहते तस्मिन् दैत्येन्द्रः परिशङ्कितः । चकार तद्वधोपायान् निर्बन्धेन युधिष्ठिर
prayāse'pahate tasmin daityendraḥ pariśaṅkitaḥ | cakāra tadvadhopāyān nirbandhena yudhiṣṭhira
SB 7.5.42