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Śrīmad-Bhāgavatam
[Canto 7, Ch. 2]
living being, they think that they can kill Lord Viṣṇu as one might kill an ordinary person. Another fact disclosed herein is that demons are very much fond of sucking blood. Indeed, all of them are meat-eaters and bloodsuckers.
Hiraṇyakaśipu accused the Supreme Lord of having a restless mind like that of a small child who can be induced to do anything if simply offered some cakes and  lāḍḍus . Indirectly, this indicates the true position of the Supreme Personality of Godhead, who says in  Bhagavad-gītā  (9.26):
patraṁ puṣpaṁ phalaṁ toyaṁ yo me bhaktyā prayacchati tad ahaṁ bhakty-upahṛtam aśnāmi prayatātmanaḥ
“If one offers Me with love and devotion a leaf, a flower, fruit or water, I will accept it.” The Lord accepts the offerings of devotees because of their transcendental love. Because they are in love with the Supreme Lord, they do not eat anything without offering it first to the Lord. The Lord does not hanker for a small leaf or flower; He has enough to eat. Indeed, He is feeding all living entities. Nonetheless, because He is very merciful and is  bhakta-vatsala , very favorable to the devotees, He certainly eats whatever they offer Him with love and devotion. This quality should not be misjudged to be childish. The highest quality of the Supreme Lord is that He is  bhakta-vatsala ; in other words, He is always extremely pleased with His devotees. As for the word  māyā , when used in reference to the dealings of the Supreme Personality of Godhead and His devotees, this word means “affection.” The actions of the Lord to favor His devotees are not disqualifications but signs of His natural affection.
As for  rudhira , or the blood of Lord Viṣṇu, since there is no possibility of severing Lord Viṣṇu’s head from His body, there is no question of blood. But the garland that decorates Viṣṇu’s body is as red as blood. When the demons achieve  sāyujya-mukti  and leave behind their sinful activities, they are blessed by Viṣṇu’s garland, which is red like blood. After attaining  sāyujya-mukti , the demons are sometimes promoted to the Vaikuṇṭha world, where they receive the reward of the Lord’s garland  prasāda .