The discourse concerning Lord Nrsimhadeva and Prahlada Maharaja began when Maharaja Yudhisthira asked Narada how Sisupala had merged into the body of Krsna

Expressions researched:
"The discourse concerning Lord Nṛsiṁhadeva and Prahlāda Mahārāja began when Mahārāja Yudhiṣṭhira asked Nārada how Śiśupāla had merged into the body of Kṛṣṇa"

Srimad-Bhagavatam

SB Canto 7

The discourse concerning Lord Nṛsiṁhadeva and Prahlāda Mahārāja began when Mahārāja Yudhiṣṭhira asked Nārada how Śiśupāla had merged into the body of Kṛṣṇa. Śiśupāla and Dantavakra were the same Hiraṇyākṣa and Hiraṇyakaśipu. Here Nārada Muni is relating how in three different births the associates of Lord Viṣṇu were killed by Lord Viṣṇu Himself. First they were the demons Hiraṇyākṣa and Hiraṇyakaśipu.

SB 7.10.35, Translation and Purport

Thus the two associates of Lord Viṣṇu who had become Hiraṇyākṣa and Hiraṇyakaśipu, the sons of Diti, were both killed. By illusion they had thought that the Supreme Lord, who is situated in everyone's heart, was their enemy.

The discourse concerning Lord Nṛsiṁhadeva and Prahlāda Mahārāja began when Mahārāja Yudhiṣṭhira asked Nārada how Śiśupāla had merged into the body of Kṛṣṇa. Śiśupāla and Dantavakra were the same Hiraṇyākṣa and Hiraṇyakaśipu. Here Nārada Muni is relating how in three different births the associates of Lord Viṣṇu were killed by Lord Viṣṇu Himself. First they were the demons Hiraṇyākṣa and Hiraṇyakaśipu.