Putrada Ekadasi
from the Bhavishya-uttara PurANa.
The pious and saintly Yudhisthira Maharaj said, “Oh Lord, You have so nicely explained to us the wonderful glories of the Saphalaa Ekaadasi, which occurs during the dark fortnight (Krishna paksha) of the month of Pausha (December – January). Now please be merciful to me and explain to me the details of the Ekaadasi that occurs in the light fortnight (Shukla or Gaura paksha) of this month. What is its name, and what Deity is to be worshipped on that