Srimad-Bhagavatam: Canto 7 - Chapter 1 - Verse 1
Sanskrit:
श्रीनारद उवाचब्रह्मचारी गुरुकुले वसन्दान्तो गुरोर्हितम् ।आचरन्दासवन्नीचो गुरौ सुदृढसौहृद: ॥ १ ॥
ITRANS:
śrī-nārada uvācabrahmacārī gurukulevasan dānto guror hitamācaran dāsavan nīcogurau sudṛḍha-sauhṛdaḥ
Translation:
Nārada Muni said: A student should practice completely controlling his senses. He should be submissive and should have an attitude of firm friendship for the spiritual master. With a great vow, the brahmacārī should live at the gurukula, only for the benefit of the guru.