Just as a small insect falls forcefully into a fire and the insignificant creature becomes invisible, when Hiraṇyakaśipu attacked the Lord, who was full of effulgence, Hiraṇyakaśipu became invisible. This is not at all astonishing, for the Lord is always situated in pure goodness. Formerly, during creation, He entered the dark universe and illuminated it by His spiritual effulgence.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
एवं ब्रुवंस्त्वभ्यपतद्गदायुधो नदन् नृसिंहं प्रति दैत्यकुञ्जरः । अलक्षितोऽग्नौ पतितः पतङ्गमो यथा नृसिंहौजसि सोऽसुरस्तदा
evaṃ bruvaṃstvabhyapatadgadāyudho nadan nṛsiṃhaṃ prati daityakuñjaraḥ | alakṣito'gnau patitaḥ pataṅgamo yathā nṛsiṃhaujasi so'surastadā
SB 7.8.24