One verse

Srimad Bhagavatam 8.16.25

8.16.25

फाल्गुनस्यामले पक्षे द्वादशाहं पयोव्रतम् । अर्चयेदरविन्दाक्षं भक्त्या परमयान्वित: ॥ २५ ॥

phalgunasyamale pakse dvadasaham payo-vratam arcayed aravindaksam bhaktya paramayanvitah

phalgunasya
of the month of Phalguna (February and March)
amale
during the bright
pakse
fortnight
dvadasa-aham
for twelve days, ending with Dvadasi, the day after Ekadasi
payah-vratam
accepting the vow of taking only milk
arcayet
one should worship
aravinda-aksam
the lotus-eyed Supreme Personality of Godhead
bhaktya
with devotion
paramaya
unalloyed
anvitah
surcharged.

In the bright fortnight of the month of Phalguna (February and March), for twelve days ending with Dvadasi, one should observe the vow of subsisting only on milk and should worship the lotus-eyed Supreme Personality of Godhead with all devotion.