In Hinduism, Mohini Ekadashi is consider a sacred and fruitful day. It is assumed that the person who fasts as per the whole ritual on this sacred date becomes lucky in his life. She/he overcomes the temptation of delusion and moves towards attaining salvation.
According to a mythological tale, a rift started between Devtas & Asuras after acquire nectar during Samudra Manthan. Even with their strength, the Devtas could not massacre Asuras, so Lord Vishnu changed into Mohini and lured Asuras in a false illusion. He took all Elixir and gave Devtas to drink it, after which they attained immortality. That is why; this Ekadashi is called as Mohini Ekadashi.
There was a beautiful city named Bhadrawati where a rich person named Dhanpal lived. He had 5 sons out of whom the youngest son was Dhrishtabuddhi. He used to waste his father’s money in bad deeds. After getting frustrated him bad habits, Dhanpal casted him out of the house. This made Dhrishtabuddhi mourn day and night and wander around. Because of some virtuous deeds, he reached Maharishi Kaundilya Ashram. The Maharishi was getting back from bathing in the Ganga.
Dhrishtabuddhi, weigh by his grieving, came to Kaundilya Rishi and pleaded, Rishi! Have some clemency on me and provide a solution, with the impact of which I could get free from all my sorrows.’ Then Kaundilya told him to do the famous Ekadashi Vrat named Mohini. By the virtue of this fast, even the sins of past lives get damaged. Dhrishtabuddhi fasted according to the rules told by the Rishi, by the virtue of which he attain salvation and went to Shri Vishnu Dham.