Pradyumna: "The word satīm is very significant. This means "existing" and "chaste," and both imports are perfectly applicable in the case of Mahārāja Parīkṣit. The whole Vedic adventure is to draw one's attention entirely unto the lotus feet of Lord Kṛṣṇa without any diversion, as it is instructed in the Bhagavad-gītā (15.15). Fortunately Mahārāja Parīkṣit had already been attracted to the Lord from the very beginning of his body, in the womb of his mother. In the womb of his mother, he was struck by the brahmāstra atomic bomb released by Aśvatthāmā, but by the grace of the Lord he was saved from being burnt by the fiery weapon, and since then the King continually concentrated his mind upon Lord Kṛṣṇa, which made him perfectly chaste in devotional service. So by natural sequence he was a chaste devotee of the Lord, and when he further heard..."
Prabhupāda: Here, one important matter is there, that Parīkṣit Mahārāja, while he was in the womb of his mother, there was brahmāstr a targeted on him by Aśvatthāmā. And he was to be killed. Practically he was killed. His mother felt a miscarriage and immediately approached Kṛṣṇa, that "I am feeling like this. The only son of the Pāṇḍava dynasty is going to be lost." So Kṛṣṇa immediately entered the womb of Uttarā and saved the baby. Now, Parīkṣit Mahārāja is recognized devotee; otherwise Kṛṣṇa would not have taken so much trouble. He wanted that Parīkṣit Mahārāja. Now, when he was cursed by a brāhmaṇa to die within seven days, why Kṛṣṇa did not save him, or why he did not seek Kṛṣṇa's protection? This question may be raised. He was young man. He was not old man. He could live. That question was made also: "The Parīkṣit Mahārāja, such a nice king, his life was dedicated for the welfare of his subjects. So actually, his body was meant for the benefit of others.