|Canto 8: Withdrawal of the Cosmic Creations||Chapter 7: Lord Śiva Saves the Universe by Drinking Poison|
Bhaktivedanta VedaBase: Śrīmad Bhāgavatam 8.7.11
tathāsurān āviśad āsureṇa
rūpeṇa teṣāḿ bala-vīryam īrayan
uddīpayan deva-gaṇāḿś ca viṣṇur
daivena nāgendram abodha-rūpaḥ
tathā — thereafter; asurān — unto the demons; āviśat — entered; āsureṇa — by the quality of passion; rūpeṇa — in such a form; teṣām — of them; bala-vīryam — strength and energy; īrayan — increasing; uddīpayan — encouraging; deva-gaṇān — the demigods; ca — also; viṣṇuḥ — Lord Viṣṇu; daivena — by the feature of goodness; nāga-indram — unto the King of the serpents, Vāsuki; abodha-rūpaḥ — by the quality of ignorance.
Thereafter, Lord Viṣṇu entered the demons as the quality of passion, the demigods as the quality of goodness, and Vāsuki as the quality of ignorance to encourage them and increase their various types of strength and energy.
Everyone in this material world is under the different modes of material nature. There were three different parties in the churning of Mandara Mountain — the demigods, who were in the mode of goodness, the demons, who were in the mode of passion, and the snake Vāsuki, who was in the mode of ignorance. Since they were all becoming tired (Vāsuki so much so that he was almost going to die), Lord Viṣṇu, to encourage them to continue the work of churning the ocean, entered into them according to their respective modes of nature — goodness, passion and ignorance.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Founder Ācārya of the International Society for Krishna Consciousness