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Śrīmad-Bhāgavatam
[Canto 7, Ch. 9]
Lord in the form of Hayagrīva killed two demons named Madhu and Kaiṭabha when they attacked Lord Brahmā. Modern demons think that there was no life in the beginning of creation, but from  Śrīmad-Bhāgavatam  we understand that the first living creature created by the Supreme Personality of Godhead was Lord Brahmā, who is full of Vedic understanding. Unfortunately, those entrusted with distributing Vedic knowledge, such as the devotees engaged in spreading Kṛṣṇa consciousness, may sometimes be attacked by demons, but they must rest assured that demoniac attacks will not be able to harm them, for the Lord is always prepared to give them protection. The  Vedas  provide the knowledge by which we can understand the Supreme Personality of Godhead ( vedaiś ca sarvair aham eva vedyaḥ ). The devotees of the Lord are always ready to spread knowledge by which one may understand the Lord through Kṛṣṇa consciousness, but the demons, being unable to understand the Supreme Lord, are full of ignorance and passion. Thus the Lord, whose form is transcendental, is always ready to kill the demons. By culturing the mode of goodness, one can understand the position of the transcendental Lord and how the Lord is always prepared to remove all obstacles on the path of understanding Him.
In summary, whenever the Lord incarnates, He appears in His original transcendental form. As the Lord says in  Bhagavad-gītā  (4.7):
yadā yadā hi dharmasya glānir bhavati bhārata abhyutthānam adharmasya tadātmānam srjāmy aham
“Whenever and wherever there is a decline in religious practice, O descendent of Bharata, and a predominant rise of irreligion—at that time I descend Myself.” It is simply foolish to think of the Lord as being originally impersonal but accepting a material body when He appears as a personal incarnation. Whenever the Lord appears, He appears in His original transcendental form, which is spiritual and blissful. But unintelligent men, such as the Māyāvādīs, cannot understand the transcendental form of the Lord, and therefore the Lord chastises them by saying,  avajānanti mām mūḍhā mānuṣīṁ tanum āśritam : “Fools deride