One verse

Srimad Bhagavatam 8.16.47

8.16.47

एवं त्वहरह: कुर्याद्‌द्वादशाहं पयोव्रतम् । हरेराराधनं होममर्हणं द्विजतर्पणम् ॥ ४७ ॥

evam tv ahar ahah kuryad dvadasaham payo-vratam harer aradhanam homam arhanam dvija-tarpanam

evam
in this way
tu
indeed
ahah ahah
day after day
kuryat
should execute
dvadasa-aham
until twelve days
payah-vratam
the observance of the vrata known as payo-vrata
hareh aradhanam
worshiping the Supreme Personality of Godhead
homam
by executing a fire sacrifice
arhanam
worshiping the Deity
dvija-tarpanam
and satisfying the brahmanas by feeding them.

In this way, until twelve days have passed, one should observe this payo-vrata, worshiping the Lord every day, executing the routine duties, performing sacrifices and feeding the brahmanas.