One verse

Srimad Bhagavatam 11.18.17

11.18.17

मौनानीहानिलायामा दण्डा वाग्देहचेतसाम् । न ह्येते यस्य सन्त्यङ्ग वेणुभिर्न भवेद् यति: ॥ १७ ॥

maunānīhānilāyāmā daṇḍā vāg-deha-cetasām na hy ete yasya santy aṅga veṇubhir na bhaved yatiḥ

mauna
avoiding useless speech
anīha
giving up fruitive activities
anila-āyāmāḥ
controlling the breathing process
daṇḍāḥ
strict disciplines
vāk
of the voice
deha
of the body
cetasām
of the mind
na
not
hi
indeed
ete
these disciplines
yasya
of whom
santi
exist
aṅga
My dear Uddhava
veṇubhiḥ
by bamboo rods
na
never
bhavet
is
yatiḥ
a real sannyāsī.

One who has not accepted the three internal disciplines of avoiding useless speech, avoiding useless activities and controlling the life air can never be considered a sannyāsī merely because of his carrying bamboo rods.