According to Padma Purana, the female energy of Vishnu slayed the demon Muran and protects the 'Devas'. This happened on the eleventh day of lunar month during the sun's journey in the Dhanu Rashi. Impressed by the act, Vishnu names her as 'Ekadashi' and gives her the boon that those who worship 'Ekadashi' on the day of her victory over Muran would reach 'Vaikunth' (His abode).