One verse

Srimad Bhagavatam 6.19.21

6.19.21

एतेन पूजाविधिना मासान् द्वादश हायनम् । नीत्वाथोपरमेत्साध्वी कार्तिके चरमेऽहनि ॥ २१ ॥

etena puja-vidhina masan dvadasa hayanam nitvathoparamet sadhvi kartike carame ’hani

etena
with this
puja-vidhina
regulated worship
masan dvadasa
twelve months
hayanam
a year
nitva
after passing
atha
then
uparamet
should fast
sadhvi
the chaste wife
kartike
in Karttika
carame ahani
on the final day.

The chaste wife must perform such devotional service continuously for one year. After one year passes, she should fast on the full-moon day in the month of Karttika (October–November).