Sri Yudhishthira Maharaja asked of Lord Sri Krishna, "What is the name of that Ekadasi that occurs during the light fortnight (shukla paksha) of the month of Bhadrapada (August-September "Hrishikesha mase") ? Who is the worshipable Deity for this Ekadasi, and what merit does one attain in observing it? Kindly reveal all of this to me my Lord."
The Supreme Personality of Godhead Lord Sri Krishna addressed His devoted Yudhishthira as follows, "This Ekadasii, Oh Yudhishthira, is called Vamana Ekada