If at any time food does not come, then a saintly person should fast for many days without making endeavor. He should understand that by God’s arrangement he must fast. Thus, following the example of the python, he should remain peaceful and patient.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
शयीताहानि भूरीणि निराहारोऽनुपक्रमः । यदि नोपनमेद्ग्रासो महाहिरिव दिष्टभुक्
śayītāhāni bhūrīṇi nirāhāro'nupakramaḥ | yadi nopanamedgrāso mahāhiriva diṣṭabhuk
SB 11.8.3