tatra - there; ekaḥ - one; puruṣaḥ - person; rājan - O King (Parīkṣit); āgataḥ - did come; apūrva - never before; darśanaḥ - whose appearance; vijñāpitaḥ - announced; bhagavate - to the Supreme Lord; pratīhāraiḥ - by the doorkeepers; praveśitaḥ - made to enter.

Once a certain person arrived in the assembly, O King, who had never been seen there before. The doorkeepers announced him to the Lord and then escorted him inside.