20 The pure brahmacari engages fully in the chanting of the holy name
The pure brahmacari engages fully in harer namanukirtanam: [Lord Krsna]:
Some of them sacrifice the hearing process and the senses in the fire of the controlled mind, and others sacrifice the objects of the senses, such as sound, in the fire of sacrifice.
The brahmacaris, or students under the care of a bona fide spiritual master, control the mind by abstaining from sense gratification. They are referred to in this verse as sacrificing the hearing process and the senses in the fire of the controlled mind. A brahmacari hears only words concerning Krsna consciousness; hearing is the basic panciple for understanding, and therefore the pure brahmacari engages fully in harer namanakirtanam−chanting and hearing the glories of the Lord. He restrains himself from the vibrations of material sounds, and his hearing is engaged in the transcendental sound vibration of Hare Krsna, Hare Krsna.
– Bhagavad gita As It Is 4.26
The brahmacari must chant the holy name upon rising in the morning:
In the morning, the first duty of a brahmacari seeking spiritual elevation is huta−hutasana, to offer sacrificial oblations to the Supreme Lord. Those engaged in brahmacarya cannot sleep until seven or nine o'clock in the morning. They must rise early in the morning, at least one and a half hours before the sun rises, and offer oblations, or in this age, they must chant the holy name of the Lord, Hare Krsna. As referred to by Lord Caitanya, kalau nasty eva nasty eva nasty eva gatir anyatha: there is no other alternative, no other alternative, no other alternative, in this age, to chanting the holy name of the Lord. The brahmacari must rise early in the morning, and, after placing himself, should chant the holy name of the Lord.
– Srimad Bhagavatam 3.21.45−47