Shiva Purana
नभगो मनुपुत्रस्तु पठनार्थं सुबुद्धि मान् ॥ चक्रे गुरुकुले वासं बहुकालं जितेन्द्रियः ॥ ५ ॥
Nabhaga the son of Manu, highly intelligent, and with perfect control of his sense-organs stayed in the abode of his preceptors for studies for a long time.
english translation
nabhago manuputrastu paThanArthaM subuddhi mAn ॥ cakre gurukule vAsaM bahukAlaM jitendriyaH ॥ 5 ॥
hk transliteration by Sanscript