Srimad Bhagavatam Canto 08, Chapter 19, Text 10

SB 8.19.10

evam sa niscitya ripoh sariram
 adhavato nirvivise ’surendra
svasanilantarhita-suksma-dehas
 tat-prana-randhrena vivigna-cetah
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Lord Vamanadeva continued: O King of the demons, after Lord Visnu made this decision, He entered the body of His enemy Hiranyakasipu, who was running after Him with great force. In a subtle body inconceivable to Hiranyakasipu, Lord Visnu, who was in great anxiety, entered Hiranyakasipu’s nostril along with his breath.
 
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
The Supreme Personality of Godhead is already in the core of everyone’s heart. isvarah sarva-bhutanam hrd-dese ’rjuna tisthati (Bg. 18.61). Logically, therefore, it was not at all difficult for Lord Visnu to enter Hiranyakasipu’s body. The word vivigna-cetah, “very anxious,” is significant. It is not that Lord Visnu was afraid of Hiranyakasipu; rather, because of compassion, Lord Visnu was in anxiety about how to act for his welfare.
Srimad Bhagavatam Canto 08, Chapter 19, Text 09
Srimad Bhagavatam Canto 08, Chapter 19, Text 11