Srimad Bhagavatam Canto 06, Chapter 12, Text 31

SB 6.12.31

nigirno ’py asurendrena
 na mamarodaram gatah
mahapurusa-sannaddho
 yoga-maya-balena ca
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
The protective armor of Narayana, which Indra possessed, was identical with Narayana Himself, the Supreme Personality of Godhead. Protected by that armor and by his own mystic power, King Indra, although swallowed by Vrtrasura, did not die within the demon’s belly.
Srimad Bhagavatam Canto 06, Chapter 12, Text 30
Srimad Bhagavatam Canto 06, Chapter 12, Text 32