Mahabharata 12.159.64
चरेयुः सर्व एवैते वीरहा यद्व्रतं चरेत्चान्द्रायणं चरेन्मासं कृच्छ्रं वा पापशुद्धये
careyuḥ sarva evaite vīrahā yadvrataṃ caretcāndrāyaṇaṃ carenmāsaṃ kṛcchraṃ vā pāpaśuddhaye
Our plain-language meaning of this verse is waiting for scholar review.
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