Srimad Bhagavatam Canto 07, Chapter 12, Text 01

SB 7.12.1

sri-narada uvaca
brahmacari gurukule
 vasan danto guror hitam
acaran dasavan nico
 gurau sudrdha-sauhrdah
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Narada 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 brahmacari should live at the gurukula, only for the benefit of the guru.
Srimad Bhagavatam Canto 07, Chapter 12, Text 02