|Canto 6: Prescribed Duties for Mankind||Chapter 12: Vṛtrāsura's Glorious Death|
Bhaktivedanta VedaBase: Śrīmad Bhāgavatam 6.12.31
nigīrṇo 'py asurendreṇa
na mamārodaraḿ gataḥ
nigīrṇaḥ — swallowed; api — although; asura-indreṇa — by the best of the demons, Vṛtrāsura; na — not; mamāra — died; udaram — the abdomen; gataḥ — reaching; mahā-puruṣa — by the armor of the Supreme Lord, Nārāyaṇa; sannaddhaḥ — being protected; yoga-māyā-balena — by the mystic power that Indra himself possessed; ca — also.
The protective armor of Nārāyaṇa, which Indra possessed, was identical with Nārāyaṇa Himself, the Supreme Personality of Godhead. Protected by that armor and by his own mystic power, King Indra, although swallowed by Vṛtrāsura, did not die within the demon's belly.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Founder Ācārya of the International Society for Krishna Consciousness