Śrīmad-Bhāgavatam · Text 6.16.27
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चित्रकेतुस्तु तां विद्यां यथा नारदभाषिताम् ।
धारयामास सप्ताहमब्भक्ष: सुसमाहित: ॥ २७ ॥
citraketus tu tāṁ vidyāṁ
yathā nārada-bhāṣitām
dhārayām āsa saptāham
ab-bhakṣaḥ susamāhitaḥ
Fasting and drinking only water, Citraketu for one week continuously chanted with great care and attention the mantra given by Nārada Muni.
Read this verse on Vedabase.ioThis verse has no purport; its meaning is explained by the verses around it.