Note 84 — Chapter XL · A DESCRIPTION OF VISHNU.
Manmatha Nath Dutt translation
This refers to the celebrated episode of Pralhada. He was the son of the Demon king Hiranyakasipu. He began worshipping Vishnu who was an enemy of Hiranykasipu. He prosecuted his son in various ways and afterwards was killed by Vishnu in his man-lion form.