One verse

Srimad Bhagavatam 7.12.5

7.12.5

सायं प्रातश्चरेद्भ‍ैक्ष्यं गुरवे तन्निवेदयेत् । भुञ्जीत यद्यनुज्ञातो नो चेदुपवसेत् क्‍वचित् ॥ ५ ॥

sayam pratas cared bhaiksyam gurave tan nivedayet bhunjita yady anujnato no ced upavaset kvacit

sayam
in the evening
pratah
in the morning
caret
should go out
bhaiksyam
to collect alms
gurave
unto the spiritual master
tat
all that he collects
nivedayet
should offer
bhunjita
he should eat
yadi
if
anujnatah
ordered (by the spiritual master)
no
otherwise
cet
if
upavaset
should observe fasting
kvacit
sometimes.

The brahmacari should go out morning and evening to collect alms, and he should offer all that he collects to the spiritual master. He should eat only if ordered to take food by the spiritual master; otherwise, if the spiritual master does not give this order, he may sometimes have to fast.