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Śrīmad-Bhāgavatam
[Canto 1, Ch. 12]
dealings with Viṣṇu Vāmanadeva are described in the Eighth Canto of  Śrīmad-Bhāgavatam  (Chapters 11 to 24).
Prahlāda Mahārāja:  A perfect devotee of Lord Kṛṣṇa (Viṣṇu). His father, Hiraṇyakaśipu, chastised him severely when he was only five years old for his becoming an unalloyed devotee of the Lord. He is the first son of Hiraṇyakaśipu, and his mother's name was Kayadhu. Prahlāda Mahārāja was an authority in the devotional service of the Lord because he got his father killed by Lord Nṛsiṁhadeva, setting the example that even a father should be removed from the path of devotional service if such a father happens to be an obstacle. He had four sons, and the eldest son, Virocana, is the father of Bali Mahārāja, mentioned above. The history of Prahlāda Mahārāja's activities is described in the Seventh Canto of  Śrīmad-Bhāgavatam .
TEXT 26
राजर्षीणां जनयिता शास्ता चोत्पथगामिनाम् । निग्रहीता कलेरेष भुवो धर्मस्य कारणात् ॥२६॥
rājarṣīnām janayitā   śāstā cotpatha-gāminām   nigrahītā kaler eṣa   bhuvo dharmasya kāraṇāt
rāja-ṛṣīnām —of kings as good as sages;  janayitā —producer;  śāstā —chastiser;  ca —and;  utpatha-gāminām —of the upstarts;  nigrahītā —molester;  kaleḥ —of the quarrelsome;  eṣaḥ —this;  bhuvaḥ —of the world;  dharmasya —of religiosity;  kāraṇāt —on account of.
TRANSLATION
This child will be the father of kings who will be like sages. For world peace and for the sake of religion, he will be the chastiser of the upstarts and the quarrelsome.
PURPORT
The wisest man in the world is a devotee of the Lord. The sages are called the wise men, and there are different types of wise men for different branches of knowledge. Unless, therefore, the king or the head of the state is the wisest man, he cannot control all types of wise men in the state. In