In his prayers to the ten incarnations, Jayadeva Gosvāmī says, keśava dhṛta-narahari-rūpa jaya jagad-īśa hare. Prahlāda Mahārāja was a devotee of Lord Nṛsiṁha, who is Keśava, Kṛṣṇa Himself. Therefore when this verse says vāsudeve bhagavati, one should understand that Prahlāda Mahārāja's attachment for Nṛsiṁhadeva was attachment for Kṛṣṇa, Vāsudeva, the son of Vasudeva. Prahlāda Mahārāja, therefore, is described as a great mahātmā.
(Srimad Bhagavatam-----7:4:36-----purport).

One may chant the holy name of Lord Kṛṣṇa, or one may chant the holy name of Lord Rāma or Nṛsiṁhadeva (rāmādi-mūrtiṣu kalā-niyamena tiṣṭhan (Bs. 5.39)). The Lord has innumerable forms and names, and devotees may meditate upon a particular form and chant the holy name according to his attraction. The best course is to hear of the holy name, form and so on from a pure devotee of the same standard as oneself. In other words, one who is attached to Kṛṣṇa should chant and hear from other pure devotees who are also attached to Lord Kṛṣṇa. The same principle applies for devotees attracted by Lord Rāma, Lord Nṛsiṁha and other forms of the Lord.
(Srimad Bhagavatam-----7:5:23-24-----purport).

Deity worship has two divisions, namely pure and mixed with fruitive activities. For one who is steady, Deity worship is compulsory. Observing the various types of festivals, such as Śrī Janmāṣṭamī, Rāma-navamī and Nṛsiṁha-caturdaśī, is also included in the process of Deity worship. In other words, it is compulsory for householder devotees to observe these festivals.
(Srimad Bhagavatam-----7:5:23-24-----purport).

As soon as Hiraṇyakaśipu struck the column, there issued forth a tumultuous sound. At first Hiraṇyakaśipu, the King of the demons, could not see anything but the pillar, but to substantiate Prahlāda's statements, the Lord came out of the pillar in His wonderful incarnation as Narasiṁha, half lion and half man. Hiraṇyakaśipu could immediately understand that the extraordinarily wonderful form of the Lord was surely meant for his death, and thus he prepared to fight with the form of half lion and half man.
(Srimad Bhagavatam-----7:8-------summary).

Prahlāda Mahārāja's Vaiṣṇava preaching to his demoniac father was indirectly effective, for because of Hiraṇyakaśipu's excessive jealousy of Kṛṣṇa and His devotee, he was inviting Nṛsiṁhadeva to kill him very quickly. Thus he was expediting his being killed by the Lord Himself. Although Hiraṇyakaśipu was a demon, he is described here by the added word śrī. Why? The answer is that fortunately he had such a great devotee son as Prahlāda Mahārāja. Thus although he was a demon, he would attain salvation and return home, back to Godhead.
(Srimad Bhagavatam-----7:8:11-----purport).

Prahlāda Mahārāja's demoniac father had repeatedly threatened to kill Prahlāda, but Prahlāda was confident that he could not be killed, since he was protected by the Supreme Lord. By appearing from the pillar, the Lord encouraged His devotee, saying in effect, "Don't worry. I am present here." By manifesting His form as Nṛsiṁhadeva, the Lord also preserved the truth of Lord Brahmā's promise that Hiraṇyakaśipu was not to be killed by any animal or any man. The Lord appeared in a form that could not be said to be fully a man or a lion.
(Srimad Bhagavatam-----7:8:17-----purport).

Hiraṇyakaśipu studied the form of the Lord, trying to decide who the form of Nṛsiṁhadeva standing before him was. The Lord's form was extremely fearsome because of His angry eyes, which resembled molten gold; His shining mane, which expanded the dimensions of His fearful face; His deadly teeth; and His razor-sharp tongue, which moved about like a dueling sword. His ears were erect and motionless, and His nostrils and gaping mouth appeared like caves of a mountain. His jaws parted fearfully, and His entire body touched the sky. His neck was very short and thick, His chest broad, His waist thin, and the hairs on His body as white as the rays of the moon. His arms, which resembled flanks of soldiers, spread in all directions as He killed the demons, rogues and atheists with His conchshell, disc, club, lotus and other natural weapons.
(Srimad Bhagavatam-----7:8:19-22-----translation).

When Hiraṇyakaśipu was in the process of being killed by Lord Nṛsiṁhadeva, the Lord gave the demon a chance to slip from His clutches. This incident was not very much appreciated by the demigods, for they were greatly afraid of Hiraṇyakaśipu. They knew that if somehow or other Hiraṇyakaśipu escaped from Nṛsiṁhadeva's hands and saw that the demigods were looking forward to his death with great pleasure, he would take great revenge upon them. Therefore they were very much afraid.
(Srimad Bhagavatam-----7:8:26-----purport).

When a sinful man enjoys material facilities, foolish people sometimes think, "How is it that this sinful man is enjoying whereas a pious man is suffering?" By the will of the Supreme, a sinful man is sometimes given the chance to enjoy the material world as if he were not under the clutches of material nature, just so that he may be fooled. A sinful man who acts against the laws of nature must be punished, but sometimes he is given a chance to play, exactly like Hiraṇyakaśipu when he was released from the hands of Nṛsiṁhadeva. Hiraṇyakaśipu was destined to be ultimately killed by Nṛsiṁhadeva, but just to see the fun, the Lord gave him a chance to slip from His hands.
(Srimad Bhagavatam-----7:8:26-----purport).

Making a loud, shrill sound of laughter, the Supreme Personality of Godhead, Nārāyaṇa, who is extremely strong and powerful, captured Hiraṇyakaśipu, who was protecting himself with his sword and shield, leaving no gaps open. With the speed of a hawk, Hiraṇyakaśipu moved sometimes in the sky and sometimes on the earth, his eyes closed because of fear of Nṛsiṁhadeva's laughter.
(Srimad Bhagavatam-----7:8:28-----translation).

As a snake captures a mouse or Garuḍa captures a very venomous snake, Lord Nṛsiṁhadeva captured Hiraṇyakaśipu, who could not be pierced even by the thunderbolt of King Indra. As Hiraṇyakaśipu moved his limbs here, there and all around, very much afflicted at being captured, Lord Nṛsiṁhadeva placed the demon on His lap, supporting him with His thighs, and in the doorway of the assembly hall the Lord very easily tore the demon to pieces with the nails of His hand.
(Srimad Bhagavatam-----7:8:29-----translation).

Hiraṇyakaśipu had received from Lord Brahmā the benediction that he would not die on the land or in the sky. Therefore, to keep the promise of Lord Brahmā intact,Nṛsiṁhadeva placed Hiraṇyakaśipu's body on His lap, which was neither land nor sky. Hiraṇyakaśipu had received the benediction that he would not die either during the day or at night. Therefore, to keep this promise of Brahmā, the Lord killed Hiraṇyakaśipu in the evening, which is the end of day and the beginning of night but is neither day nor night. Hiraṇyakaśipu had taken a benediction from Lord Brahmā that he would not die from any weapon or be killed by any person, dead or alive. Therefore, just to keep the word of Lord Brahmā, Lord Nṛsiṁhadeva pierced Hiraṇyakaśipu's body with His nails, which were not weapons and were neither living nor dead. Indeed, the nails can be called dead, but at the same time they can be said to be alive. To keep intact all of Lord Brahmā's benedictions, Lord Nṛsiṁhadeva paradoxically but very easily killed the great demon Hiraṇyakaśipu.
(Srimad Bhagavatam-----7:8:29-----purport).

Lord Nṛsiṁhadeva's mouth and mane were sprinkled with drops of blood, and His fierce eyes, full of anger, were impossible to look at. Licking the edge of His mouth with His tongue, the Supreme Personality of Godhead, Nṛsiṁhadeva, decorated with a garland of intestines taken from Hiraṇyakaśipu's abdomen, resembled a lion that has just killed an elephant.
(Srimad Bhagavatam-----7:8:30-----translation).

The hair on Lord Nṛsiṁhadeva's face, being sprinkled with drops of blood, was reddish and looked very beautiful. Lord Nṛsiṁhadeva pierced Hiraṇyakaśipu's abdomen with His nails, pulled out the demon's intestines and wore them as a garland, which enhanced His beauty. Thus the Lord became very fearsome, like a lion engaged in fighting an elephant.
(Srimad Bhagavatam-----7:8:30-----purport).

The Supreme Personality of Godhead, who had many, many arms, first uprooted Hiraṇyakaśipu's heart and then threw him aside and turned toward the demon's soldiers. These soldiers had come in thousands to fight with Him with raised weapons and were very faithful followers of Hiraṇyakaśipu, but LordNṛsiṁhadeva killed all of them merely with the ends of His nails.
(Srimad Bhagavatam-----7:8:31-----translation).

The hair on Nṛsiṁhadeva's head shook the clouds and scattered them here and there, His glaring eyes stole the effulgence of the luminaries in the sky, and His breathing agitated the seas and oceans. Because of His roaring, all the elephants in the world began to cry in fear.
(Srimad Bhagavatam-----7:8:32-----translation).

Airplanes were thrown into outer space and the upper planetary system by the hair on Nṛsiṁhadeva's head. Because of the pressure of the Lord's lotus feet, the earth appeared to slip from its position, and all the hills and mountains sprang up due to His intolerable force. Because of the Lord's bodily effulgence, both the sky and all directions diminished in their natural illumination.
(Srimad Bhagavatam-----7:8:32-----translation).

Manifesting a full effulgence and a fearsome countenance, Lord Nṛsiṁha, being very angry and finding no contestant to face His power and opulence, then sat down in the assembly hall on the excellent throne of the king. Because of fear and obedience, no one could come forward to serve the Lord directly.
(Srimad Bhagavatam-----7:8:34-----translation).

Hiraṇyakaśipu had been exactly like a fever of meningitis in the head of the three worlds. Thus when the wives of the demigods in the heavenly planets saw that the great demon had been killed by the personal hands of the Supreme Personality of Godhead, their faces blossomed in great joy. The wives of the demigods again and again showered flowers from heaven upon Lord Nṛsiṁhadeva like rain.
(Srimad Bhagavatam-----7:8:35-----translation).

All the saintly persons present offered their prayers in this way: O Lord, O supreme maintainer of those sheltered at Your lotus feet, O original Personality of Godhead, the process of austerity and penance, in which You instructed us before, is the spiritual power of Your very self. It is by austerity that You create the material world, which lies dormant within You. This austerity was almost stopped by the activities of this demon, but now, by Yourself appearing in the form of Nṛsiṁhadeva, which is meant just to give us protection, and by killing this demon, You have again approved the process of austerity.
(Srimad Bhagavatam-----7:8:43-----translation).

A devotee of the Lord cannot tolerate blasphemy of the Lord or His other devotees, and the Lord also cannot tolerate blasphemy of a devotee. Thus Lord Nṛsiṁhadeva was so very angry that the great demigods like Lord Brahmā and Lord Śiva and even the goddess of fortune, who is the Lord's constant companion, could not pacify Him, even after offering prayers of glorification and praise. No one was able to pacify the Lord in His anger, but because the Lord was willing to exhibit His affection for Prahlāda Mahārāja, all the demigods and the others present before the Lord pushed Prahlāda Mahārāja forward to pacify Him.
(Srimad Bhagavatam-----7:9:1-----purport).

Lord Nṛsiṁhadeva's fierce appearance was certainly most dangerous for the nondevotees, but for Prahlāda Mahārāja such a fearful appearance was not at all disturbing. The lion is very fearsome for other animals, but its cubs are not at all afraid of the lion. The water of the sea is certainly dreadful for all living entities on the land, but within the sea even the small fish is unafraid. Why? Because the small fish has taken shelter of the big ocean.
(Srimad Bhagavatam-----7:9:15-----purport).

Prahlāda Mahārāja was surprised at the causeless mercy of the Supreme Lord, the Personality of Godhead, for although Prahlāda was born in a demoniac family and although the Lord had never before placed His lotus hand on the head of Brahmā, Śiva or the goddess of fortune, His constant companion, Lord Nṛsiṁhadeva kindly placed His hand on the head of Prahlāda. This is the meaning of causeless mercy. The causeless mercy of the Supreme Personality of Godhead may be bestowed upon anyone, regardless of his position in this material world.
(Srimad Bhagavatam-----7:9:26-----purport).

My dear Lord Nṛsiṁhadeva, I see that there are many saintly persons indeed, but they are interested only in their own deliverance. Not caring for the big cities and towns, they go to the Himalayas or the forest to meditate with vows of silence (mauna-vrata). They are not interested in delivering others. As for me, however, I do not wish to be liberated alone, leaving aside all these poor fools and rascals. I know that without Kṛṣṇa consciousness, without taking shelter of Your lotus feet, one cannot be happy. Therefore I wish to bring them back to shelter at Your lotus feet.
(Srimad Bhagavatam-----7:9:26-----translation).