kaumāra-brahmacāriṇaḥ

astasiti-eighty-eight; sahasrani-thousand; munayah-great saintly persons; ye-those who; dhrta-vratah-fixed in vows; anvasiksan-took instructions; vratam-vows; tasya-from him (Vibhu); kaumara-who was unmarried; brahmacarinah-and fixed in the brahmacari stage of life.