Śrīmad-Bhāgavatam · Text 7.12.23
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यदाकल्प: स्वक्रियायां व्याधिभिर्जरयाथवा ।
आन्वीक्षिक्यां वा विद्यायां कुर्यादनशनादिकम् ॥ २३ ॥
yadākalpaḥ sva-kriyāyāṁ
vyādhibhir jarayāthavā
ānvīkṣikyāṁ vā vidyāyāṁ
kuryād anaśanādikam
When because of disease or old age one is unable to perform his prescribed duties for advancement in spiritual consciousness or study of the Vedas, he should practice fasting, not taking any food.
Read this verse on Vedabase.ioThis verse has no purport; its meaning is explained by the verses around it.