Salutation unto thee who art both one and many, Vāsudeva and the first cause of all. Salutation unto that excellent Purusha, who is both large and small, manifest and hidden, who is present in all beings and not, and from whom proceeds the universe although distinct from universal cause". Parāçara said:—While with his mind thus devoted to Vishnu Prahlāda chanted his praises; the Great Hari, clad in yellow suddenly appeared before him.
In plain words: Prahlada bows to Vasudeva (a name of Vishnu), who is both one and many, the first cause of everything, present in all beings and yet beyond them. The sage Parashara, who tells the story, says that as Prahlada sang this, Vishnu, dressed in yellow, suddenly appeared in front of him.