This is the time when the festival of Paryushan is celebrated and the Kalpasutra is traditionally recited.
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In Jainism, the third part of the classical Jain text Kalpa Sutra, written by Bhadrabahu I in 1st century CE, deals with rules for ascetics and laws during the four months (chaturmas) of the rainy season, when ascetics temporarily abandon their wandering life and settle down amidst the laity.
The devotees observe very strict rules during the months of Chaturmas (the months from Ashadha through Kartik).