Mahabharata 3.39.21

दर्भचीरं निवस्याथ दण्डाजिनविभूषितःपूर्णे पूर्णे त्रिरात्रे तु मासमेकं फलाशनःद्विगुणेनैव कालेन द्वितीयं मासमत्यगात्

darbhacīraṃ nivasyātha daṇḍājinavibhūṣitaḥpūrṇe pūrṇe trirātre tu māsamekaṃ phalāśanaḥdviguṇenaiva kālena dvitīyaṃ māsamatyagāt

Our plain-language meaning of this verse is waiting for scholar review.