The legend and the significance of Parsva Parivartini Ekadashi or Vamana or Jayanthi Ekadasi are mentioned in Brahma-vivarta Purana as a conversation between Yudhistira and Lord Krishna.
Lord Krishna explained the benefits, glory and the importance of Bhadrapada Shukla Ekadashi. Parshva Parivatana Ekadashi 2018 date is September 20. Parshva Parivatini Ekadasi is also referred asJal Zilani Ekadasi or Jaljini Ekadashi.
Story of Vamana Ekadashi, Vaman Ekadasi Vrat katha:
Vamana Ekadashi is the day on which Lord Vamana pressed down the demon King Mahabali into Patala. Lord Vishnu was incarnated as Vaman to protect Indras rule over the heavens, which was disturbed by King Mahabali. King Mahabali was so generous and so much devoted to Lord Vishnu but he was a demon. To restore Indras powers on the heavens, King Mahabali should not rule the Earth. For that purpose, Vishnu incarnated as Vaman and went to Mahabali to beg three steps of land to live in.
King Mahabali agreed to give Vamana, a dwarf brahmin, to give three steps of land. Shukracharya, Mahabalis Guru, warned him that the dwarf brahmin is Vishnu and not an innocent brahmachari. But Bali ignored his warning and went ahead to donate three steps of land. Then, Lord Vaman, the Supreme God Vishnu, grows so huge to cover the heaven and the earth in two simple steps. King Bali was unable to stand by his words, offers his head for the third step. Then Vamana puts his third foot on Bali and provides him immortality as a reward for his great benevolence.
Significance and Benefits of Vamana or Jayanti Ekadashi Vrath
Lord Vamana is an avatar of Vishnu who was incarnated to annihilate the evilness of demons on the Earth. Though, King Mahabali is one of the greatest kings and great devotee of Vishnu, Lord considered him as a demon. Increasing demons population on the Earth may become a big problem for the existence of the world. To get rid of this, Vishnu incarnated as Vaman and routed Bali into the Paataal.
Observing Vamana Ekadasi vrata and keeping fast on this Ekadashi frees the devotee from all his sins and provides him moksha (salvation).